Hermes-agent

apps/bootstrap-installer/src-tauri/src/bootstrap.rs

@@ -0,0 +1,906 @@
+//! Bootstrap orchestration.
+//!
+//! Direct port of `runBootstrap` from `apps/desktop/electron/bootstrap-runner.cjs`.
+//! Drives install.ps1 / install.sh stage-by-stage, emits progress events
+//! over the Tauri `bootstrap` channel, writes a forensic log to
+//! HERMES_HOME/logs/bootstrap-<timestamp>.log.
+//!
+//! Lifecycle:
+//!   1. `start_bootstrap` (Tauri command) → spawns the worker task.
+//!   2. Worker resolves install script (dev/cache/download).
+//!   3. Worker calls `install.ps1 -Manifest` → emits `manifest` event.
+//!   4. Worker iterates stages, calling `install.ps1 -Stage NAME -NonInteractive -Json`.
+//!   5. On success → `complete`. On any stage failure → `failed`. On cancel → `failed`.
+
+use std::path::PathBuf;
+use std::sync::Arc;
+use std::time::Instant;
+
+use anyhow::{anyhow, Result};
+use serde::{Deserialize, Serialize};
+use tauri::{AppHandle, Emitter, State};
+use tokio::sync::{mpsc, Mutex};
+
+use crate::events::{BootstrapEvent, LogStream, Manifest, StageState};
+use crate::install_script::{self, Pin, ScriptKind, ScriptSource};
+use crate::powershell::{self, StreamSink};
+use crate::AppState;
+
+// ---------------------------------------------------------------------------
+// Public Tauri commands
+// ---------------------------------------------------------------------------
+
+/// Frontend → Rust: kick off the install.
+#[derive(Debug, Deserialize)]
+pub struct StartBootstrapArgs {
+    /// Optional override for the commit pin. Defaults to the build-time
+    /// pin baked in via `BUILD_PIN_COMMIT`.
+    pub commit: Option<String>,
+    /// Optional override for the branch pin. Defaults to `BUILD_PIN_BRANCH`.
+    pub branch: Option<String>,
+    /// Include Stage-Desktop (build apps/desktop) in the manifest. The
+    /// signed bootstrap installer passes true; the deprecated Electron-side
+    /// bootstrap-runner passes false to avoid building-while-running.
+    #[serde(default = "default_true")]
+    pub include_desktop: bool,
+    /// Optional override for HERMES_HOME. Tests use this; production
+    /// almost always falls back to the OS default.
+    pub hermes_home: Option<String>,
+}
+
+fn default_true() -> bool {
+    true
+}
+
+#[derive(Debug, Serialize)]
+pub struct BootstrapStatus {
+    pub running: bool,
+    pub completed: bool,
+    pub install_root: Option<String>,
+    pub last_error: Option<String>,
+}
+
+/// Handle stored in AppState while a bootstrap run is in flight. Carries
+/// the cancellation channel and the most recent terminal status so the
+/// frontend can re-query after a window refresh.
+pub struct BootstrapHandle {
+    pub cancel_tx: mpsc::Sender<()>,
+    pub started_at: Instant,
+    pub status: BootstrapStatus,
+}
+
+#[tauri::command]
+pub async fn start_bootstrap(
+    app: AppHandle,
+    state: State<'_, Arc<AppState>>,
+    args: StartBootstrapArgs,
+) -> Result<(), String> {
+    let mut guard = state.bootstrap.lock().await;
+    if let Some(h) = guard.as_ref() {
+        if h.status.running {
+            return Err("Bootstrap is already running".into());
+        }
+    }
+
+    let (cancel_tx, cancel_rx) = mpsc::channel::<()>(1);
+    let handle = BootstrapHandle {
+        cancel_tx,
+        started_at: Instant::now(),
+        status: BootstrapStatus {
+            running: true,
+            completed: false,
+            install_root: None,
+            last_error: None,
+        },
+    };
+    *guard = Some(handle);
+    drop(guard);
+
+    let app_for_task = app.clone();
+    let state_for_task = state.inner().clone();
+    let args_for_task = args;
+    let cancel_rx = Arc::new(Mutex::new(Some(cancel_rx)));
+
+    tokio::spawn(async move {
+        let result = run_bootstrap(app_for_task.clone(), args_for_task, cancel_rx).await;
+
+        // Reflect terminal state into AppState so get_bootstrap_status()
+        // can serve it after the task exits.
+        let mut guard = state_for_task.bootstrap.lock().await;
+        if let Some(h) = guard.as_mut() {
+            h.status.running = false;
+            match &result {
+                Ok(install_root) => {
+                    h.status.completed = true;
+                    h.status.install_root = Some(install_root.clone());
+                    h.status.last_error = None;
+                }
+                Err(err) => {
+                    h.status.completed = false;
+                    h.status.last_error = Some(err.to_string());
+                }
+            }
+        }
+    });
+
+    Ok(())
+}
+
+#[tauri::command]
+pub async fn cancel_bootstrap(state: State<'_, Arc<AppState>>) -> Result<(), String> {
+    let guard = state.bootstrap.lock().await;
+    if let Some(h) = guard.as_ref() {
+        let _ = h.cancel_tx.try_send(());
+    }
+    Ok(())
+}
+
+#[tauri::command]
+pub async fn get_bootstrap_status(
+    state: State<'_, Arc<AppState>>,
+) -> Result<BootstrapStatus, String> {
+    let guard = state.bootstrap.lock().await;
+    Ok(match guard.as_ref() {
+        Some(h) => BootstrapStatus {
+            running: h.status.running,
+            completed: h.status.completed,
+            install_root: h.status.install_root.clone(),
+            last_error: h.status.last_error.clone(),
+        },
+        None => BootstrapStatus {
+            running: false,
+            completed: false,
+            install_root: None,
+            last_error: None,
+        },
+    })
+}
+
+/// Spawn the locally-built Hermes desktop binary, then close the installer
+/// window. Caller resolves the binary path from `install_root`.
+///
+/// Returns Err with a human-readable message if the binary doesn't exist
+/// (e.g. when Stage-Desktop was skipped) so the frontend can present
+/// actionable failure UI rather than silently doing nothing.
+#[tauri::command]
+pub async fn launch_hermes_desktop(
+    app: AppHandle,
+    install_root: String,
+) -> Result<(), String> {
+    let install_root = PathBuf::from(install_root);
+    let exe_path = resolve_hermes_desktop_exe(&install_root).ok_or_else(|| {
+        format!(
+            "Couldn't find a built Hermes desktop at {}. The desktop build step \
+             may have been skipped or failed. Run `hermes desktop` from a \
+             terminal to build and launch it.",
+            install_root.join("apps").join("desktop").join("release").display()
+        )
+    })?;
+
+    tracing::info!(?exe_path, "launching Hermes desktop");
+
+    // Detach from us — the installer is about to exit. On macOS launch the
+    // bundle through LaunchServices instead of exec'ing Contents/MacOS/Hermes
+    // directly; this matches user double-click/open behavior and avoids cwd /
+    // quarantine oddities after a self-update rebuild.
+    let mut cmd = desktop_launch_command(&exe_path, &install_root);
+    #[cfg(target_os = "windows")]
+    {
+        use std::os::windows::process::CommandExt;
+        // DETACHED_PROCESS = 0x00000008
+        cmd.creation_flags(0x0000_0008);
+    }
+
+    cmd.spawn().map_err(|e| {
+        format!(
+            "failed to launch {}: {e}",
+            exe_path.display()
+        )
+    })?;
+
+    // Give Windows ~150ms to actually start the new process before we exit.
+    tokio::time::sleep(std::time::Duration::from_millis(150)).await;
+
+    // Exit the installer cleanly. Tauri's process plugin gives us the
+    // right hook regardless of platform.
+    app.exit(0);
+    Ok(())
+}
+
+/// Walks the well-known electron-builder unpacked-app paths under
+/// `install_root`. Mirrors the resolver in `cmd_gui` (apps/desktop/release/
+/// <os>-unpacked/<exe>).
+pub(crate) fn resolve_hermes_desktop_exe(install_root: &std::path::Path) -> Option<PathBuf> {
+    let release_dir = install_root.join("apps").join("desktop").join("release");
+    let candidates: &[(&str, &str)] = if cfg!(target_os = "windows") {
+        &[
+            ("win-unpacked", "Hermes.exe"),
+            ("win-arm64-unpacked", "Hermes.exe"),
+        ]
+    } else if cfg!(target_os = "macos") {
+        &[
+            ("mac/Hermes.app/Contents/MacOS", "Hermes"),
+            ("mac-arm64/Hermes.app/Contents/MacOS", "Hermes"),
+        ]
+    } else {
+        &[("linux-unpacked", "hermes")]
+    };
+    for (subdir, exe) in candidates {
+        let p = release_dir.join(subdir).join(exe);
+        if p.exists() {
+            return Some(p);
+        }
+    }
+    None
+}
+
+pub(crate) fn resolve_hermes_desktop_app(install_root: &std::path::Path) -> Option<PathBuf> {
+    let exe = resolve_hermes_desktop_exe(install_root)?;
+    #[cfg(target_os = "macos")]
+    {
+        // .../Hermes.app/Contents/MacOS/Hermes -> .../Hermes.app
+        let app = exe.parent()?.parent()?.parent()?.to_path_buf();
+        if app.extension().and_then(|e| e.to_str()) == Some("app") && app.is_dir() {
+            return Some(app);
+        }
+    }
+    #[cfg(not(target_os = "macos"))]
+    {
+        return Some(exe);
+    }
+    #[allow(unreachable_code)]
+    None
+}
+
+/// True when a prior install completed (bootstrap-complete marker present) AND a
+/// launchable desktop app exists on disk. Used by the installer's launcher fast
+/// path so a bare re-open just opens Hermes instead of re-running setup.
+pub(crate) fn hermes_is_installed(install_root: &std::path::Path) -> bool {
+    install_root.join(".hermes-bootstrap-complete").exists()
+        && resolve_hermes_desktop_exe(install_root).is_some()
+}
+
+/// Spawn the already-built desktop app, detached. Returns Err if no built app
+/// exists or the spawn fails, so the caller can fall back to showing the
+/// installer UI.
+pub(crate) fn spawn_installed_desktop(install_root: &std::path::Path) -> std::io::Result<()> {
+    let exe = resolve_hermes_desktop_exe(install_root).ok_or_else(|| {
+        std::io::Error::new(std::io::ErrorKind::NotFound, "no built Hermes desktop app")
+    })?;
+    let mut cmd = desktop_launch_command_std(&exe, install_root);
+    #[cfg(target_os = "windows")]
+    {
+        use std::os::windows::process::CommandExt;
+        // DETACHED_PROCESS = 0x00000008 — keep the desktop alive after the
+        // installer exits, mirroring launch_hermes_desktop. Kept correct here
+        // even though the only caller is macOS-gated today, so future reuse on
+        // Windows doesn't reintroduce the relaunch race.
+        cmd.creation_flags(0x0000_0008);
+    }
+    cmd.spawn().map(|_child| ())
+}
+
+#[cfg(target_os = "macos")]
+pub(crate) fn open_macos_app_detached(app_bundle: &std::path::Path) -> std::io::Result<()> {
+    let mut cmd = std::process::Command::new("/usr/bin/open");
+    cmd.arg(app_bundle);
+    cmd.current_dir(crate::paths::hermes_home());
+    cmd.spawn().map(|_child| ())
+}
+
+#[cfg(target_os = "macos")]
+fn app_bundle_for_exe(exe: &std::path::Path) -> Option<PathBuf> {
+    let app = exe.parent()?.parent()?.parent()?.to_path_buf();
+    if app.extension().and_then(|e| e.to_str()) == Some("app") && app.is_dir() {
+        Some(app)
+    } else {
+        None
+    }
+}
+
+fn desktop_launch_command(
+    exe_path: &std::path::Path,
+    install_root: &std::path::Path,
+) -> tokio::process::Command {
+    #[cfg(target_os = "macos")]
+    {
+        if let Some(app_bundle) = app_bundle_for_exe(exe_path) {
+            let mut cmd = tokio::process::Command::new("/usr/bin/open");
+            cmd.arg(app_bundle);
+            cmd.current_dir(crate::paths::hermes_home());
+            return cmd;
+        }
+    }
+
+    let mut cmd = tokio::process::Command::new(exe_path);
+    cmd.current_dir(exe_path.parent().unwrap_or(install_root));
+    cmd
+}
+
+fn desktop_launch_command_std(
+    exe_path: &std::path::Path,
+    install_root: &std::path::Path,
+) -> std::process::Command {
+    #[cfg(target_os = "macos")]
+    {
+        if let Some(app_bundle) = app_bundle_for_exe(exe_path) {
+            let mut cmd = std::process::Command::new("/usr/bin/open");
+            cmd.arg(app_bundle);
+            cmd.current_dir(crate::paths::hermes_home());
+            return cmd;
+        }
+    }
+
+    let mut cmd = std::process::Command::new(exe_path);
+    cmd.current_dir(exe_path.parent().unwrap_or(install_root));
+    cmd
+}
+
+// ---------------------------------------------------------------------------
+// Bootstrap implementation
+// ---------------------------------------------------------------------------
+
+async fn run_bootstrap(
+    app: AppHandle,
+    args: StartBootstrapArgs,
+    cancel_rx_holder: Arc<Mutex<Option<mpsc::Receiver<()>>>>,
+) -> Result<String> {
+    let kind = ScriptKind::for_current_os();
+
+    let pin = Pin {
+        commit: args.commit.or_else(|| option_env_string("BUILD_PIN_COMMIT")),
+        branch: args.branch.or_else(|| option_env_string("BUILD_PIN_BRANCH")),
+    };
+
+    tracing::info!(
+        ?pin,
+        kind = ?kind,
+        include_desktop = args.include_desktop,
+        "bootstrap starting"
+    );
+
+    let app_for_log = app.clone();
+    let emit_log = move |line: &str| {
+        emit_event(
+            &app_for_log,
+            BootstrapEvent::Log {
+                stage: None,
+                line: line.to_string(),
+                stream: LogStream::Stdout,
+            },
+        );
+        // Bump to info-level so the line shows in bootstrap-installer.log
+        // under the default INFO filter. Previously this was debug! which
+        // got dropped on the floor, leaving us blind whenever install.ps1
+        // failed — the log only had the "bootstrap starting" banner.
+        tracing::info!(target: "bootstrap.log", "{line}");
+    };
+
+    // 1. Resolve install.ps1
+    let script = install_script::resolve(kind, &pin, &emit_log)
+        .await
+        .map_err(|e| {
+            let msg = format!("resolve install script failed: {e:#}");
+            emit_event(
+                &app,
+                BootstrapEvent::Failed {
+                    stage: None,
+                    error: msg.clone(),
+                },
+            );
+            anyhow!(msg)
+        })?;
+
+    let source_note = match &script.source {
+        ScriptSource::DevCheckout => "dev checkout",
+        ScriptSource::Bundled => "bundled",
+        ScriptSource::Cached => "cached",
+        ScriptSource::Downloaded => "downloaded",
+    };
+    emit_log(&format!(
+        "[bootstrap] script {} via {}",
+        script.path.display(),
+        source_note
+    ));
+
+    // 2. Fetch manifest
+    //
+    // -IncludeDesktop MUST be passed to the manifest call too — install.ps1
+    // gates the desktop stage inclusion on this flag, so without it here
+    // the manifest comes back missing the desktop stage and we never run
+    // it. The per-stage call below also passes -IncludeDesktop to keep
+    // the contracts identical.
+    let manifest_args = build_pin_args(&script);
+    let mut manifest_args_full = vec!["-Manifest".to_string()];
+    manifest_args_full.extend(manifest_args.clone());
+    if args.include_desktop {
+        manifest_args_full.push("-IncludeDesktop".to_string());
+    }
+
+    let manifest_result = run_install_script(
+        &app,
+        &script.path,
+        &manifest_args_full,
+        args.hermes_home.as_deref(),
+        None,
+        Some("__manifest__".to_string()),
+    )
+    .await?;
+
+    if manifest_result.exit_code != Some(0) {
+        let err = format!(
+            "install.ps1 -Manifest failed: exit {:?}\n{}",
+            manifest_result.exit_code,
+            manifest_result.stderr.trim()
+        );
+        emit_event(
+            &app,
+            BootstrapEvent::Failed {
+                stage: None,
+                error: err.clone(),
+            },
+        );
+        return Err(anyhow!(err));
+    }
+
+    let manifest: Manifest = powershell::parse_manifest(&manifest_result.stdout).ok_or_else(|| {
+        let err = format!(
+            "install.ps1 -Manifest produced no parseable JSON payload\n{}",
+            truncate(&manifest_result.stdout, 4000)
+        );
+        emit_event(
+            &app,
+            BootstrapEvent::Failed {
+                stage: None,
+                error: err.clone(),
+            },
+        );
+        anyhow!(err)
+    })?;
+
+    emit_event(
+        &app,
+        BootstrapEvent::Manifest {
+            stages: manifest.stages.clone(),
+            protocol_version: manifest.protocol_version,
+        },
+    );
+
+    // 3. Iterate stages.
+    for stage in &manifest.stages {
+        // Skip Stage-Desktop unless explicitly requested. install.ps1 may
+        // or may not include it in the manifest depending on the flag we
+        // pass, but if it slipped in, gate client-side too.
+        if !args.include_desktop && stage.name.eq_ignore_ascii_case("desktop") {
+            emit_event(
+                &app,
+                BootstrapEvent::Stage {
+                    name: stage.name.clone(),
+                    state: StageState::Skipped,
+                    duration_ms: Some(0),
+                    result: None,
+                    error: Some("skipped by include_desktop=false".into()),
+                },
+            );
+            continue;
+        }
+
+        if cancellation_signalled(&cancel_rx_holder).await {
+            let err = "bootstrap cancelled by user".to_string();
+            emit_event(
+                &app,
+                BootstrapEvent::Failed {
+                    stage: Some(stage.name.clone()),
+                    error: err.clone(),
+                },
+            );
+            return Err(anyhow!(err));
+        }
+
+        let started = Instant::now();
+        emit_event(
+            &app,
+            BootstrapEvent::Stage {
+                name: stage.name.clone(),
+                state: StageState::Running,
+                duration_ms: None,
+                result: None,
+                error: None,
+            },
+        );
+
+        let mut stage_args = vec![
+            "-Stage".to_string(),
+            stage.name.clone(),
+            "-NonInteractive".to_string(),
+            "-Json".to_string(),
+        ];
+        stage_args.extend(manifest_args.clone());
+        if args.include_desktop {
+            stage_args.push("-IncludeDesktop".to_string());
+        }
+
+        // Each stage gets its own cancel receiver because tokio::select!
+        // in run_script consumes it. Take/return through the Arc<Mutex>.
+        let local_cancel_rx = cancel_rx_holder.lock().await.take();
+
+        let stage_result = run_install_script(
+            &app,
+            &script.path,
+            &stage_args,
+            args.hermes_home.as_deref(),
+            local_cancel_rx,
+            Some(stage.name.clone()),
+        )
+        .await?;
+
+        let duration_ms = started.elapsed().as_millis() as u64;
+
+        if stage_result.killed {
+            emit_event(
+                &app,
+                BootstrapEvent::Stage {
+                    name: stage.name.clone(),
+                    state: StageState::Failed,
+                    duration_ms: Some(duration_ms),
+                    result: None,
+                    error: Some("cancelled by user".into()),
+                },
+            );
+            emit_event(
+                &app,
+                BootstrapEvent::Failed {
+                    stage: Some(stage.name.clone()),
+                    error: "cancelled by user".into(),
+                },
+            );
+            return Err(anyhow!("cancelled by user"));
+        }
+
+        let result_frame = powershell::parse_stage_result(&stage_result.stdout);
+
+        match result_frame {
+            None => {
+                let err = format!(
+                    "install.ps1 -Stage {} produced no JSON result frame (exit={:?})",
+                    stage.name, stage_result.exit_code
+                );
+                emit_event(
+                    &app,
+                    BootstrapEvent::Stage {
+                        name: stage.name.clone(),
+                        state: StageState::Failed,
+                        duration_ms: Some(duration_ms),
+                        result: None,
+                        error: Some(err.clone()),
+                    },
+                );
+                emit_event(
+                    &app,
+                    BootstrapEvent::Failed {
+                        stage: Some(stage.name.clone()),
+                        error: err.clone(),
+                    },
+                );
+                return Err(anyhow!(err));
+            }
+            Some(frame) if frame.ok && frame.skipped => {
+                emit_event(
+                    &app,
+                    BootstrapEvent::Stage {
+                        name: stage.name.clone(),
+                        state: StageState::Skipped,
+                        duration_ms: Some(duration_ms),
+                        result: Some(frame),
+                        error: None,
+                    },
+                );
+            }
+            Some(frame) if frame.ok => {
+                emit_event(
+                    &app,
+                    BootstrapEvent::Stage {
+                        name: stage.name.clone(),
+                        state: StageState::Succeeded,
+                        duration_ms: Some(duration_ms),
+                        result: Some(frame),
+                        error: None,
+                    },
+                );
+            }
+            Some(frame) => {
+                let err = frame
+                    .reason
+                    .clone()
+                    .unwrap_or_else(|| format!("exit code {:?}", stage_result.exit_code));
+                emit_event(
+                    &app,
+                    BootstrapEvent::Stage {
+                        name: stage.name.clone(),
+                        state: StageState::Failed,
+                        duration_ms: Some(duration_ms),
+                        result: Some(frame),
+                        error: Some(err.clone()),
+                    },
+                );
+                emit_event(
+                    &app,
+                    BootstrapEvent::Failed {
+                        stage: Some(stage.name.clone()),
+                        error: err.clone(),
+                    },
+                );
+                return Err(anyhow!(err));
+            }
+        }
+    }
+
+    // 4. Resolve install_root. install.ps1 doesn't (yet) report this back
+    // explicitly; we infer it from $HermesHome which Stage-Repository clones
+    // the repo INTO at $HermesHome\hermes-agent. Mirrors hermes_constants.
+    let hermes_home = args
+        .hermes_home
+        .clone()
+        .unwrap_or_else(|| crate::paths::hermes_home().to_string_lossy().into_owned());
+    let install_root = PathBuf::from(&hermes_home).join("hermes-agent");
+
+    // Copy ourselves to HERMES_HOME/hermes-setup.exe so the desktop app can
+    // re-invoke us with `--update` and shortcuts have a stable target. This is
+    // a one-shot install concern; an `--update` re-invocation no-ops because
+    // we're already running from that path. Best-effort — a failure here must
+    // not fail an otherwise-successful install.
+    if let Err(err) = crate::paths::copy_self_to_hermes_home() {
+        tracing::warn!(?err, "failed to copy installer into HERMES_HOME (non-fatal)");
+        emit_log(&format!(
+            "[bootstrap] warning: could not stage updater binary: {err}"
+        ));
+    }
+
+    emit_event(
+        &app,
+        BootstrapEvent::Complete {
+            install_root: install_root.to_string_lossy().into_owned(),
+            marker: Some(serde_json::json!({
+                "pinnedCommit": pin.commit,
+                "pinnedBranch": pin.branch,
+            })),
+        },
+    );
+
+    Ok(install_root.to_string_lossy().into_owned())
+}
+
+async fn cancellation_signalled(holder: &Arc<Mutex<Option<mpsc::Receiver<()>>>>) -> bool {
+    let mut guard = holder.lock().await;
+    if let Some(rx) = guard.as_mut() {
+        rx.try_recv().is_ok()
+    } else {
+        false
+    }
+}
+
+async fn run_install_script(
+    app: &AppHandle,
+    script_path: &std::path::Path,
+    args: &[String],
+    hermes_home_override: Option<&str>,
+    cancel_rx: Option<mpsc::Receiver<()>>,
+    stage_name: Option<String>,
+) -> Result<powershell::ScriptResult> {
+    let app_for_stdout = app.clone();
+    let stage_for_stdout = stage_name.clone();
+    let app_for_stderr = app.clone();
+    let stage_for_stderr = stage_name.clone();
+    let stage_for_stdout_log = stage_name.clone();
+    let stage_for_stderr_log = stage_name.clone();
+
+    let sink = StreamSink {
+        on_stdout_line: Box::new(move |line: &str| {
+            emit_event(
+                &app_for_stdout,
+                BootstrapEvent::Log {
+                    stage: stage_for_stdout.clone(),
+                    line: line.to_string(),
+                    stream: LogStream::Stdout,
+                },
+            );
+            // Tee to the rolling installer log so we have a persistent
+            // record of every install.ps1 line. Without this, the only
+            // log evidence of a failure was the Tauri event stream —
+            // which gets discarded the moment the failure route mounts.
+            match &stage_for_stdout_log {
+                Some(name) => {
+                    tracing::info!(target: "bootstrap.log", stage = %name, "{line}")
+                }
+                None => tracing::info!(target: "bootstrap.log", "{line}"),
+            }
+        }),
+        on_stderr_line: Box::new(move |line: &str| {
+            emit_event(
+                &app_for_stderr,
+                BootstrapEvent::Log {
+                    stage: stage_for_stderr.clone(),
+                    line: line.to_string(),
+                    stream: LogStream::Stderr,
+                },
+            );
+            // stderr-level lines get warn! so they're visually distinct
+            // when scrolling through the log later.
+            match &stage_for_stderr_log {
+                Some(name) => {
+                    tracing::warn!(target: "bootstrap.log", stage = %name, "stderr: {line}")
+                }
+                None => tracing::warn!(target: "bootstrap.log", "stderr: {line}"),
+            }
+        }),
+    };
+
+    powershell::run_script(script_path, args, sink, hermes_home_override, cancel_rx)
+        .await
+        .map_err(|e| {
+            tracing::error!(?e, "install script invocation failed");
+            anyhow!("install script invocation failed: {e:#}")
+        })
+}
+
+fn build_pin_args(script: &install_script::ResolvedScript) -> Vec<String> {
+    let mut out = Vec::new();
+    if let Some(c) = &script.commit {
+        out.push("-Commit".to_string());
+        out.push(c.clone());
+    }
+    if let Some(b) = &script.branch {
+        out.push("-Branch".to_string());
+        out.push(b.clone());
+    }
+    out
+}
+
+fn emit_event(app: &AppHandle, event: BootstrapEvent) {
+    // Tee important state transitions to the rolling installer log so
+    // bootstrap-installer.log isn't just "starting" + final summary.
+    // Log lines (the noisy stuff) handle their own tracing in
+    // run_install_script's sink; here we cover the lifecycle frames.
+    match &event {
+        BootstrapEvent::Manifest { stages, .. } => {
+            tracing::info!(
+                stage_count = stages.len(),
+                names = ?stages.iter().map(|s| s.name.as_str()).collect::<Vec<_>>(),
+                "manifest received"
+            );
+        }
+        BootstrapEvent::Stage {
+            name,
+            state,
+            duration_ms,
+            error,
+            ..
+        } => {
+            tracing::info!(
+                stage = %name,
+                ?state,
+                duration_ms = ?duration_ms,
+                error = ?error,
+                "stage transition"
+            );
+        }
+        BootstrapEvent::Complete { install_root, .. } => {
+            tracing::info!(install_root = %install_root, "bootstrap complete");
+        }
+        BootstrapEvent::Failed { stage, error } => {
+            tracing::error!(stage = ?stage, error = %error, "bootstrap FAILED");
+        }
+        BootstrapEvent::Log { .. } => {
+            // Log lines are teed via the sink callbacks in
+            // run_install_script — don't double-emit here.
+        }
+    }
+    if let Err(e) = app.emit(BootstrapEvent::CHANNEL, &event) {
+        tracing::warn!(?e, "failed to emit bootstrap event");
+    }
+}
+
+fn option_env_string(key: &str) -> Option<String> {
+    // option_env! only accepts literals, so we hardcode the known keys.
+    let val = match key {
+        "BUILD_PIN_COMMIT" => option_env!("BUILD_PIN_COMMIT"),
+        "BUILD_PIN_BRANCH" => option_env!("BUILD_PIN_BRANCH"),
+        _ => None,
+    };
+    val.map(|s| s.to_string())
+}
+
+fn truncate(s: &str, max: usize) -> String {
+    if s.len() <= max {
+        s.to_string()
+    } else {
+        format!("{}...", &s[..max])
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use std::path::PathBuf;
+    use std::path::Path;
+
+    fn unique_tmp_dir(tag: &str) -> PathBuf {
+        let base = std::env::temp_dir().join(format!(
+            "hermes-bootstrap-test-{tag}-{}-{}",
+            std::process::id(),
+            std::time::SystemTime::now()
+                .duration_since(std::time::UNIX_EPOCH)
+                .unwrap()
+                .as_nanos()
+        ));
+        std::fs::create_dir_all(&base).unwrap();
+        base
+    }
+
+    // Build a fake built-desktop release tree at the platform's expected path
+    // and return (install_root, expected_app_bundle_or_exe).
+    fn make_release_tree(install_root: &Path) -> PathBuf {
+        let release = install_root.join("apps").join("desktop").join("release");
+        if cfg!(target_os = "macos") {
+            let macos_dir = release
+                .join("mac-arm64")
+                .join("Hermes.app")
+                .join("Contents")
+                .join("MacOS");
+            std::fs::create_dir_all(&macos_dir).unwrap();
+            std::fs::write(macos_dir.join("Hermes"), b"#!/bin/sh\n").unwrap();
+            macos_dir.parent().unwrap().parent().unwrap().to_path_buf() // .../Hermes.app
+        } else if cfg!(target_os = "windows") {
+            let dir = release.join("win-unpacked");
+            std::fs::create_dir_all(&dir).unwrap();
+            let exe = dir.join("Hermes.exe");
+            std::fs::write(&exe, b"stub").unwrap();
+            exe
+        } else {
+            let dir = release.join("linux-unpacked");
+            std::fs::create_dir_all(&dir).unwrap();
+            let exe = dir.join("hermes");
+            std::fs::write(&exe, b"stub").unwrap();
+            exe
+        }
+    }
+
+    // The relaunch / install target is derived from the rebuilt desktop app.
+    // On macOS this MUST resolve to the .app bundle (what `open` relaunches and
+    // what the updater ditto's over /Applications/Hermes.app). A regression in
+    // this derivation breaks the post-update auto-relaunch, so guard it.
+    #[test]
+    fn resolve_hermes_desktop_app_finds_built_bundle() {
+        let root = unique_tmp_dir("app-ok");
+        let expected = make_release_tree(&root);
+
+        let resolved = resolve_hermes_desktop_app(&root)
+            .expect("should resolve the freshly-built desktop app");
+
+        #[cfg(target_os = "macos")]
+        {
+            assert_eq!(resolved, expected, "must resolve to the .app bundle");
+            assert_eq!(
+                resolved.extension().and_then(|e| e.to_str()),
+                Some("app"),
+                "relaunch target must be a .app bundle on macOS"
+            );
+        }
+        #[cfg(not(target_os = "macos"))]
+        {
+            assert_eq!(resolved, expected);
+        }
+        let _ = std::fs::remove_dir_all(&root);
+    }
+
+    #[test]
+    fn resolve_hermes_desktop_app_is_none_without_a_build() {
+        let root = unique_tmp_dir("app-none");
+        // No release tree created.
+        assert!(
+            resolve_hermes_desktop_app(&root).is_none(),
+            "no resolved app when nothing has been built"
+        );
+        let _ = std::fs::remove_dir_all(&root);
+    }
+}

apps/bootstrap-installer/src-tauri/src/events.rs

@@ -0,0 +1,112 @@
+//! Event types streamed from Rust → React.
+//!
+//! These mirror `apps/desktop/electron/bootstrap-runner.cjs`'s event shape
+//! 1:1 so the React installer code can be roughly identical to the Electron
+//! install-overlay we'll replace.
+//!
+//! The Tauri event channel name is `"bootstrap"` for all of these — the
+//! `type` discriminator on each payload is how the frontend routes.
+
+use serde::{Deserialize, Serialize};
+
+/// Stage definition as reported by `install.ps1 -Manifest`.
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct StageInfo {
+    pub name: String,
+    pub title: String,
+    pub category: String,
+    /// `needs_user_input=true` stages run with -NonInteractive and emit
+    /// skipped=true; the post-install wizard takes over for those.
+    #[serde(rename = "needs_user_input", alias = "needsUserInput")]
+    pub needs_user_input: bool,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct Manifest {
+    pub stages: Vec<StageInfo>,
+    #[serde(rename = "protocol_version", alias = "protocolVersion", default)]
+    pub protocol_version: Option<u32>,
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct StageResultPayload {
+    pub stage: String,
+    pub ok: bool,
+    #[serde(default)]
+    pub skipped: bool,
+    #[serde(default)]
+    pub reason: Option<String>,
+    /// install.ps1 may attach stage-specific structured data here.
+    #[serde(default)]
+    pub data: Option<serde_json::Value>,
+}
+
+/// Run-state for a single stage as we transition through it.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize, Deserialize)]
+#[serde(rename_all = "lowercase")]
+pub enum StageState {
+    Running,
+    Succeeded,
+    Skipped,
+    Failed,
+}
+
+/// Which pipe a raw log line came from. Reported as structured metadata so
+/// the UI can style stderr subtly rather than mislabeling it as an error:
+/// uv/pip/git/npm write normal progress to stderr by design.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Serialize)]
+#[serde(rename_all = "lowercase")]
+pub enum LogStream {
+    Stdout,
+    Stderr,
+}
+
+/// The single event channel `bootstrap` emits these. `type` discriminates.
+#[derive(Debug, Clone, Serialize)]
+#[serde(tag = "type", rename_all = "lowercase")]
+pub enum BootstrapEvent {
+    /// Sent once at the start with the full stage list.
+    Manifest {
+        stages: Vec<StageInfo>,
+        #[serde(rename = "protocolVersion")]
+        protocol_version: Option<u32>,
+    },
+    /// Stage state transition. `result` populated only on terminal states.
+    Stage {
+        name: String,
+        state: StageState,
+        #[serde(rename = "durationMs", skip_serializing_if = "Option::is_none")]
+        duration_ms: Option<u64>,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        result: Option<StageResultPayload>,
+        #[serde(skip_serializing_if = "Option::is_none")]
+        error: Option<String>,
+    },
+    /// Raw stdout/stderr line from install.ps1 (or our wrapper). `stream`
+    /// tells the UI which pipe it came from so stderr can be styled subtly
+    /// instead of being mislabeled as an error.
+    Log {
+        #[serde(skip_serializing_if = "Option::is_none")]
+        stage: Option<String>,
+        line: String,
+        stream: LogStream,
+    },
+    /// Sent once when all stages complete successfully.
+    Complete {
+        #[serde(rename = "installRoot")]
+        install_root: String,
+        marker: Option<serde_json::Value>,
+    },
+    /// Sent once if the run aborts.
+    Failed {
+        #[serde(skip_serializing_if = "Option::is_none")]
+        stage: Option<String>,
+        error: String,
+    },
+}
+
+impl BootstrapEvent {
+    /// Tauri event name. Single channel for all bootstrap events; the
+    /// `type` tag tells the renderer how to interpret the payload.
+    pub const CHANNEL: &'static str = "bootstrap";
+}

apps/bootstrap-installer/src-tauri/src/install_script.rs

@@ -0,0 +1,273 @@
+//! Resolves and downloads `scripts/install.ps1` (and `install.sh`).
+//!
+//! Resolution order:
+//!   1. Dev shortcut: a sibling repo checkout via $HERMES_SETUP_DEV_REPO_ROOT
+//!      env var. Lets devs iterate without re-publishing the script.
+//!   2. Bundled fallback: if the installer was bundled with a script (e.g.
+//!      tauri's `resource` mechanism), serve from there. Not used today.
+//!   3. Network: download from GitHub raw at a pinned commit or branch.
+//!      Commit pins are immutable; branch pins are HEAD-tracking.
+//!
+//! Mirrors `apps/desktop/electron/bootstrap-runner.cjs`'s `resolveInstallScript`,
+//! but the dev-checkout resolution is driven by an env var rather than the
+//! Electron app's APP_ROOT/../.. trick, because Hermes-Setup.exe is meant
+//! to live OUTSIDE any repo checkout.
+
+use anyhow::{anyhow, Context, Result};
+use std::path::{Path, PathBuf};
+use tokio::io::AsyncWriteExt;
+
+use crate::paths;
+
+/// Identity of the install.ps1 we'll execute. Used by both the manifest
+/// fetch and the per-stage runs.
+#[derive(Debug, Clone)]
+pub struct ResolvedScript {
+    pub path: PathBuf,
+    pub source: ScriptSource,
+    /// Commit pin (40-char SHA) if known. install.ps1's `-Commit` arg is
+    /// what makes the repo stage clone the exact tested SHA.
+    pub commit: Option<String>,
+    pub branch: Option<String>,
+}
+
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum ScriptSource {
+    DevCheckout,
+    Bundled,
+    Cached,
+    Downloaded,
+}
+
+/// What flavor of script (Windows .ps1 vs Unix .sh).
+#[derive(Debug, Clone, Copy)]
+pub enum ScriptKind {
+    Ps1,
+    Sh,
+}
+
+impl ScriptKind {
+    pub fn for_current_os() -> Self {
+        if cfg!(target_os = "windows") {
+            Self::Ps1
+        } else {
+            Self::Sh
+        }
+    }
+
+    fn filename(&self) -> &'static str {
+        match self {
+            Self::Ps1 => "install.ps1",
+            Self::Sh => "install.sh",
+        }
+    }
+}
+
+/// Validates a string looks like a git SHA (7+ hex chars). Mirrors
+/// `STAMP_COMMIT_RE` from bootstrap-runner.cjs.
+fn is_valid_commit(s: &str) -> bool {
+    let len = s.len();
+    (7..=40).contains(&len) && s.chars().all(|c| c.is_ascii_hexdigit())
+}
+
+/// Resolves the install script to use for this run.
+///
+/// `pin` is the commit-or-branch from either Hermes-Setup's build-time
+/// constant (compiled into the installer) or a runtime override.
+pub async fn resolve(
+    kind: ScriptKind,
+    pin: &Pin,
+    emit_log: &impl Fn(&str),
+) -> Result<ResolvedScript> {
+    // 1. Dev shortcut.
+    if let Ok(repo_root) = std::env::var("HERMES_SETUP_DEV_REPO_ROOT") {
+        let candidate = PathBuf::from(repo_root).join("scripts").join(kind.filename());
+        if candidate.exists() {
+            emit_log(&format!(
+                "[bootstrap] dev mode — using local {} at {}",
+                kind.filename(),
+                candidate.display()
+            ));
+            return Ok(ResolvedScript {
+                path: candidate,
+                source: ScriptSource::DevCheckout,
+                commit: pin.commit.clone(),
+                branch: pin.branch.clone(),
+            });
+        }
+    }
+
+    // 2. (Not implemented) bundled fallback.
+
+    // 3. Network. Pin must be a real commit or a branch ref.
+    let commit_or_ref = match (&pin.commit, &pin.branch) {
+        (Some(c), _) if is_valid_commit(c) => c.clone(),
+        (_, Some(b)) if !b.trim().is_empty() => b.clone(),
+        (Some(other), _) => {
+            return Err(anyhow!(
+                "install script pin commit `{other}` is not a valid git SHA"
+            ));
+        }
+        _ => {
+            return Err(anyhow!(
+                "no install-script pin supplied — installer cannot resolve a script source"
+            ));
+        }
+    };
+
+    let cached = cached_path(kind, &commit_or_ref);
+    if cached.exists() {
+        emit_log(&format!(
+            "[bootstrap] using cached {} for {}",
+            kind.filename(),
+            truncate_ref(&commit_or_ref)
+        ));
+        return Ok(ResolvedScript {
+            path: cached,
+            source: ScriptSource::Cached,
+            commit: pin.commit.clone(),
+            branch: pin.branch.clone(),
+        });
+    }
+
+    emit_log(&format!(
+        "[bootstrap] downloading {} for {} from GitHub",
+        kind.filename(),
+        truncate_ref(&commit_or_ref)
+    ));
+
+    download(kind, &commit_or_ref, &cached).await?;
+
+    emit_log(&format!("[bootstrap] cached to {}", cached.display()));
+
+    Ok(ResolvedScript {
+        path: cached,
+        source: ScriptSource::Downloaded,
+        commit: pin.commit.clone(),
+        branch: pin.branch.clone(),
+    })
+}
+
+#[derive(Debug, Clone, Default)]
+pub struct Pin {
+    pub commit: Option<String>,
+    pub branch: Option<String>,
+}
+
+fn cached_path(kind: ScriptKind, commit_or_ref: &str) -> PathBuf {
+    let safe = sanitize_ref(commit_or_ref);
+    let filename = match kind {
+        ScriptKind::Ps1 => format!("install-{safe}.ps1"),
+        ScriptKind::Sh => format!("install-{safe}.sh"),
+    };
+    paths::bootstrap_cache_dir().join(filename)
+}
+
+/// Replace anything that's not [A-Za-z0-9._-] with `_`. Branch refs can
+/// contain `/`, dots, etc.; we want a flat filename.
+fn sanitize_ref(s: &str) -> String {
+    s.chars()
+        .map(|c| {
+            if c.is_ascii_alphanumeric() || c == '.' || c == '-' || c == '_' {
+                c
+            } else {
+                '_'
+            }
+        })
+        .collect()
+}
+
+fn truncate_ref(s: &str) -> &str {
+    if is_valid_commit(s) && s.len() >= 12 {
+        &s[..12]
+    } else {
+        s
+    }
+}
+
+/// Downloads to `dest_path` via reqwest with rustls. Atomically renames
+/// `dest_path.tmp` → `dest_path` so partial writes don't poison the cache.
+async fn download(kind: ScriptKind, commit_or_ref: &str, dest_path: &Path) -> Result<()> {
+    let url = format!(
+        "https://raw.githubusercontent.com/NousResearch/hermes-agent/{}/scripts/{}",
+        commit_or_ref,
+        kind.filename()
+    );
+
+    if let Some(parent) = dest_path.parent() {
+        std::fs::create_dir_all(parent).with_context(|| {
+            format!("creating bootstrap-cache parent dir {}", parent.display())
+        })?;
+    }
+
+    let tmp_path = dest_path.with_extension({
+        let ext = dest_path
+            .extension()
+            .and_then(|s| s.to_str())
+            .unwrap_or("tmp");
+        format!("{ext}.tmp")
+    });
+
+    let response = reqwest::Client::new()
+        .get(&url)
+        .header("User-Agent", "hermes-setup/0.0.1")
+        .send()
+        .await
+        .with_context(|| format!("GET {url}"))?;
+
+    if !response.status().is_success() {
+        return Err(anyhow!(
+            "Failed to download {}: HTTP {} from {}",
+            kind.filename(),
+            response.status(),
+            url
+        ));
+    }
+
+    let bytes = response
+        .bytes()
+        .await
+        .with_context(|| format!("reading body of {url}"))?;
+
+    let mut file = tokio::fs::File::create(&tmp_path)
+        .await
+        .with_context(|| format!("creating temp file {}", tmp_path.display()))?;
+    file.write_all(&bytes)
+        .await
+        .with_context(|| format!("writing temp file {}", tmp_path.display()))?;
+    file.flush().await.context("flushing temp file")?;
+    drop(file);
+
+    tokio::fs::rename(&tmp_path, dest_path)
+        .await
+        .with_context(|| {
+            format!(
+                "renaming {} → {}",
+                tmp_path.display(),
+                dest_path.display()
+            )
+        })?;
+
+    Ok(())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn is_valid_commit_accepts_short_and_full_shas() {
+        assert!(is_valid_commit("02d26981d3d4ad50e142399b8476f59ad5953ff0"));
+        assert!(is_valid_commit("02d2698"));
+        assert!(!is_valid_commit("02d269"));
+        assert!(!is_valid_commit("not-a-sha"));
+        assert!(!is_valid_commit(""));
+    }
+
+    #[test]
+    fn sanitize_ref_replaces_slashes() {
+        assert_eq!(sanitize_ref("bb/gui"), "bb_gui");
+        assert_eq!(sanitize_ref("main"), "main");
+        assert_eq!(sanitize_ref("release/1.2.3"), "release_1.2.3");
+    }
+}

apps/bootstrap-installer/src-tauri/src/lib.rs

@@ -0,0 +1,232 @@
+//! Hermes Setup — Tauri entrypoint.
+//!
+//! Spawns a single window pointed at the React frontend (apps/bootstrap-installer/src/).
+//! All install-time work lives in `bootstrap.rs` and is invoked through the Tauri
+//! commands registered at the bottom of `run()`.
+//!
+//! The Windows-subsystem strip lives on the binary crate (src/main.rs), not
+//! here — a crate-level attribute on a lib doesn't propagate to the linker
+//! flags of the executable that consumes it.
+
+mod bootstrap;
+mod events;
+mod install_script;
+mod powershell;
+mod paths;
+mod update;
+
+use std::sync::Arc;
+use tokio::sync::Mutex;
+
+/// How the installer was invoked. Resolved once from the process args in
+/// `run()` and exposed to the frontend via `get_mode` so it can route to the
+/// install flow (first-run onboarding) or the update flow (driven by the
+/// desktop app handing off via `Hermes-Setup.exe --update`).
+///
+/// Bare launch (double-click, first-run) => Install.
+/// `--update` (spawned by the desktop's "Update" button) => Update.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, serde::Serialize)]
+#[serde(rename_all = "lowercase")]
+pub enum AppMode {
+    Install,
+    Update,
+}
+
+impl AppMode {
+    /// Resolve the mode from an argument iterator. Anything containing the
+    /// `--update` flag selects Update; otherwise Install. Kept arg-iterator
+    /// generic (not reading `std::env` directly) so it's unit-testable.
+    pub fn from_args<I, S>(args: I) -> Self
+    where
+        I: IntoIterator<Item = S>,
+        S: AsRef<str>,
+    {
+        for a in args {
+            if a.as_ref() == "--update" {
+                return AppMode::Update;
+            }
+        }
+        AppMode::Install
+    }
+}
+
+/// Returns true when the args request a forced installer UI (repair/reinstall)
+/// via `--reinstall` or `--repair`, which overrides the macOS launcher
+/// fast-path so a broken install can be repaired. Arg-iterator generic so it's
+/// unit-testable, mirroring `AppMode::from_args`. Independent of mode selection:
+/// these flags never flip Install<->Update.
+pub fn force_setup_from_args<I, S>(args: I) -> bool
+where
+    I: IntoIterator<Item = S>,
+    S: AsRef<str>,
+{
+    args.into_iter()
+        .any(|a| a.as_ref() == "--reinstall" || a.as_ref() == "--repair")
+}
+
+/// Process-wide install state, shared across Tauri commands.
+///
+/// The bootstrap is a one-shot, single-tenant process — we only need one
+/// of these per window. `Arc<Mutex<...>>` lets command handlers grab it
+/// without lifetime gymnastics.
+pub struct AppState {
+    pub bootstrap: Mutex<Option<bootstrap::BootstrapHandle>>,
+    /// How this process was launched (install vs update). Immutable for the
+    /// lifetime of the process; read by the `get_mode` command.
+    pub mode: AppMode,
+}
+
+impl AppState {
+    fn new(mode: AppMode) -> Self {
+        Self {
+            bootstrap: Mutex::new(None),
+            mode,
+        }
+    }
+}
+
+/// Frontend → Rust: which flow should the UI render?
+#[tauri::command]
+fn get_mode(state: tauri::State<'_, Arc<AppState>>) -> AppMode {
+    state.mode
+}
+
+#[cfg_attr(mobile, tauri::mobile_entry_point)]
+pub fn run() {
+    // Tracing → bootstrap-installer.log under HERMES_HOME/logs/ so install
+    // failures leave a trail for support. Console output also goes here in
+    // debug builds.
+    let _guard = paths::init_logging();
+
+    let mode = AppMode::from_args(std::env::args().skip(1));
+    // Escape hatch: `--reinstall`/`--repair` forces the installer UI even when
+    // Hermes is already installed, so users can re-run setup to repair a broken
+    // install instead of the launcher fast path silently relaunching the app.
+    let force_setup = force_setup_from_args(std::env::args().skip(1));
+    tracing::info!(?mode, force_setup, "Hermes installer starting");
+
+    tauri::Builder::default()
+        .plugin(tauri_plugin_dialog::init())
+        .plugin(tauri_plugin_opener::init())
+        .plugin(tauri_plugin_process::init())
+        .plugin(tauri_plugin_shell::init())
+        .manage(Arc::new(AppState::new(mode)))
+        .setup(move |app| {
+            use tauri::Manager;
+            // Launcher fast path (macOS only): a bare ("Install") launch when
+            // Hermes is already installed should NOT show the installer or
+            // rebuild — it should just open the app, so the /Applications
+            // "Hermes" doubles as a normal launcher (first run installs, every
+            // later run launches instantly). The window is kept hidden until
+            // here via `"visible": false` so this path never flashes a window.
+            //
+            // Gated to macOS deliberately: on Windows/Linux the installer keeps
+            // its existing behavior (Windows users relaunch via the Start
+            // Menu/Desktop "Hermes" shortcuts that install.ps1 creates, and a
+            // reliable detached relaunch there needs the DETACHED_PROCESS +
+            // startup-grace handling used by launch_hermes_desktop — out of
+            // scope here). So this is a pure no-op on non-macOS.
+            //
+            // `--reinstall`/`--repair` opts out so a broken install can be
+            // repaired by re-running setup instead of launching the bad app.
+            if cfg!(target_os = "macos") && mode == AppMode::Install && !force_setup {
+                let install_root = paths::hermes_home().join("hermes-agent");
+                if bootstrap::hermes_is_installed(&install_root) {
+                    match bootstrap::spawn_installed_desktop(&install_root) {
+                        Ok(()) => {
+                            // Brief grace so the spawned app is registered
+                            // before we exit (mirrors launch_hermes_desktop).
+                            std::thread::sleep(std::time::Duration::from_millis(200));
+                            tracing::info!(
+                                "hermes already installed — relaunched desktop; exiting installer"
+                            );
+                            app.handle().exit(0);
+                            return Ok(());
+                        }
+                        Err(err) => {
+                            tracing::warn!(
+                                ?err,
+                                "relaunch of installed desktop failed; showing installer UI"
+                            );
+                        }
+                    }
+                }
+            }
+            // First run / repair install, or Update mode: reveal the UI.
+            match app.get_webview_window("main") {
+                Some(win) => {
+                    if let Err(err) = win.show() {
+                        tracing::error!(?err, "failed to show main installer window");
+                    }
+                }
+                None => {
+                    tracing::error!("main installer window not found; installer UI will not appear");
+                }
+            }
+            Ok(())
+        })
+        .invoke_handler(tauri::generate_handler![
+            // Mode (install vs update)
+            get_mode,
+            // Bootstrap lifecycle
+            bootstrap::start_bootstrap,
+            bootstrap::cancel_bootstrap,
+            bootstrap::get_bootstrap_status,
+            // Update lifecycle
+            update::start_update,
+            // Hand-off
+            bootstrap::launch_hermes_desktop,
+            // Diagnostics
+            paths::get_log_path,
+            paths::get_hermes_home,
+            paths::open_log_dir,
+        ])
+        .run(tauri::generate_context!())
+        .expect("error while running Hermes Setup");
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{force_setup_from_args, AppMode};
+
+    #[test]
+    fn bare_args_are_install() {
+        assert_eq!(AppMode::from_args(Vec::<String>::new()), AppMode::Install);
+        assert_eq!(AppMode::from_args(["--foo", "bar"]), AppMode::Install);
+    }
+
+    #[test]
+    fn update_flag_selects_update() {
+        assert_eq!(AppMode::from_args(["--update"]), AppMode::Update);
+        assert_eq!(
+            AppMode::from_args(["--something", "--update", "--else"]),
+            AppMode::Update
+        );
+    }
+
+    #[test]
+    fn reinstall_and_repair_flags_force_setup() {
+        assert!(force_setup_from_args(["--reinstall"]));
+        assert!(force_setup_from_args(["--repair"]));
+        assert!(force_setup_from_args(["--foo", "--repair", "--bar"]));
+    }
+
+    #[test]
+    fn bare_or_unrelated_args_do_not_force_setup() {
+        assert!(!force_setup_from_args(Vec::<String>::new()));
+        assert!(!force_setup_from_args(["--foo", "bar"]));
+        // --update must not be mistaken for a force-setup flag.
+        assert!(!force_setup_from_args(["--update"]));
+    }
+
+    #[test]
+    fn force_setup_flags_do_not_affect_mode_selection() {
+        // The repair flags must never flip Install<->Update.
+        assert_eq!(AppMode::from_args(["--reinstall"]), AppMode::Install);
+        assert_eq!(AppMode::from_args(["--repair"]), AppMode::Install);
+        assert_eq!(
+            AppMode::from_args(["--update", "--reinstall"]),
+            AppMode::Update
+        );
+    }
+}

apps/bootstrap-installer/src-tauri/src/main.rs

@@ -0,0 +1,19 @@
+// Hermes Setup — process entrypoint. All logic lives in lib.rs so it can
+// be unit-tested as a library; this file just calls into it.
+//
+// The windows_subsystem attribute MUST live here on the binary crate
+// (not lib.rs) — placing it on the lib was the bug that left a stray
+// cmd window behind Hermes-Setup.exe on release builds.
+//
+// `windows_subsystem = "windows"` strips the console allocation that
+// the default `windows_subsystem = "console"` would do, so double-clicking
+// the .exe gives you ONLY the Tauri window.
+//
+// debug_assertions guard: dev builds keep the console so tracing output
+// is visible during `cargo tauri dev`.
+
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+fn main() {
+    hermes_bootstrap_lib::run()
+}

apps/bootstrap-installer/src-tauri/src/paths.rs

@@ -0,0 +1,197 @@
+//! Filesystem paths + logging setup.
+//!
+//! Mirrors `hermes_constants.get_hermes_home()` from the Python CLI:
+//!   Windows: %LOCALAPPDATA%\hermes
+//!   macOS:   ~/.hermes
+//!   Linux:   ~/.hermes  (override via $HERMES_HOME)
+//!
+//! NOTE (macOS): Python's get_hermes_home(), scripts/install.sh, and the
+//! Electron desktop's resolveHermesHome() ALL use ~/.hermes on macOS — there
+//! is no ~/Library/Application Support branch anywhere else. An earlier
+//! version of this file used Application Support, which drifted from every
+//! other component: the installer wrote the install to one dir and the
+//! desktop looked for it in another, so first launch never found the backend.
+//!
+//! IMPORTANT: this must match exactly. Drift here means install.ps1
+//! writes to one place and the installer reads from another, breaking
+//! the bootstrap-complete check.
+
+use std::path::{Path, PathBuf};
+#[cfg(target_os = "macos")]
+use std::process::Command;
+use tracing_appender::non_blocking::WorkerGuard;
+
+/// Returns the canonical Hermes home directory, respecting $HERMES_HOME if set.
+pub fn hermes_home() -> PathBuf {
+    if let Ok(override_path) = std::env::var("HERMES_HOME") {
+        if !override_path.trim().is_empty() {
+            return PathBuf::from(override_path);
+        }
+    }
+
+    #[cfg(target_os = "windows")]
+    {
+        // %LOCALAPPDATA%\hermes — matches scripts/install.ps1's $HermesHome.
+        if let Some(local_app_data) = dirs::data_local_dir() {
+            return local_app_data.join("hermes");
+        }
+    }
+
+    // macOS + Linux + fallback: ~/.hermes (matches Python get_hermes_home(),
+    // install.sh, and the Electron desktop's resolveHermesHome()).
+    if let Some(home) = dirs::home_dir() {
+        return home.join(".hermes");
+    }
+
+    // Last resort — current dir, almost certainly wrong but at least
+    // doesn't panic.
+    PathBuf::from(".hermes")
+}
+
+pub fn log_dir() -> PathBuf {
+    hermes_home().join("logs")
+}
+
+pub fn log_path() -> PathBuf {
+    log_dir().join("bootstrap-installer.log")
+}
+
+pub fn bootstrap_cache_dir() -> PathBuf {
+    hermes_home().join("bootstrap-cache")
+}
+
+/// Stable location the installer copies itself to after a successful install.
+/// The desktop app re-invokes this with `--update`, and the start-menu /
+/// desktop shortcuts can point users back to it. Lives directly under
+/// HERMES_HOME so it survives repo checkout deletion (unlike anything under
+/// hermes-agent/).
+///
+/// On Windows this is `%LOCALAPPDATA%\hermes\hermes-setup.exe`; on other
+/// platforms the extension differs but the directory is the same.
+pub fn installer_dest() -> PathBuf {
+    let name = if cfg!(target_os = "windows") {
+        "hermes-setup.exe"
+    } else {
+        "hermes-setup"
+    };
+    hermes_home().join(name)
+}
+
+/// Copy the currently-running installer binary to `installer_dest()` so it's
+/// available for future `--update` runs and shortcut launches.
+///
+/// No-ops (returns Ok) when the running exe is ALREADY the destination — which
+/// is exactly the case during an `--update` run (the desktop launched us FROM
+/// that path), where copying onto ourselves would be a Windows sharing
+/// violation. Best-effort: a failure here must not fail the install, so the
+/// caller logs and continues.
+pub fn copy_self_to_hermes_home() -> std::io::Result<()> {
+    let src = std::env::current_exe()?;
+    let dest = installer_dest();
+
+    // Skip if we're already running from the destination (update re-invocation
+    // or a prior copy). canonicalize both so symlinks / 8.3 short paths / case
+    // differences don't trick us into a self-copy.
+    let same = match (src.canonicalize(), dest.canonicalize()) {
+        (Ok(a), Ok(b)) => a == b,
+        _ => src == dest,
+    };
+    if same {
+        tracing::info!(?dest, "installer already at destination; skipping self-copy");
+        return Ok(());
+    }
+
+    if let Some(parent) = dest.parent() {
+        std::fs::create_dir_all(parent)?;
+    }
+    std::fs::copy(&src, &dest)?;
+    repair_macos_installer_helper(&dest);
+    tracing::info!(?src, ?dest, "copied installer to HERMES_HOME");
+    Ok(())
+}
+
+#[cfg(target_os = "macos")]
+fn repair_macos_installer_helper(path: &Path) {
+    // The staged helper may inherit quarantine from the downloaded installer.
+    // Desktop later launches this exact file for in-app updates, so make it
+    // executable before the update handoff reaches LaunchServices/Gatekeeper.
+    let _ = Command::new("/usr/bin/xattr")
+        .args(["-cr"])
+        .arg(path)
+        .status();
+
+    let verify = Command::new("/usr/bin/codesign")
+        .arg("--verify")
+        .arg(path)
+        .status();
+
+    if !matches!(verify, Ok(status) if status.success()) {
+        let _ = Command::new("/usr/bin/codesign")
+            .args(["--force", "--sign", "-"])
+            .arg(path)
+            .status();
+    }
+}
+
+#[cfg(not(target_os = "macos"))]
+fn repair_macos_installer_helper(_path: &Path) {}
+
+/// Where install.ps1 writes the bootstrap-complete marker (existence-only file
+/// the Electron app also checks). Per main.cjs:
+///   const BOOTSTRAP_COMPLETE_MARKER = path.join(ACTIVE_HERMES_ROOT, '.hermes-bootstrap-complete')
+/// We don't always know ACTIVE_HERMES_ROOT until install.ps1 reports it, so
+/// this is a probe helper, not a definitive path.
+pub fn likely_bootstrap_marker(install_root: &Path) -> PathBuf {
+    install_root.join(".hermes-bootstrap-complete")
+}
+
+/// Initializes tracing to bootstrap-installer.log under HERMES_HOME/logs/.
+/// Returns a guard that flushes the appender on drop — keep it alive for
+/// the lifetime of the process.
+pub fn init_logging() -> Option<WorkerGuard> {
+    let dir = log_dir();
+    if let Err(err) = std::fs::create_dir_all(&dir) {
+        // No log dir → log to stderr only. Don't panic; the installer
+        // should still be usable on an exotic filesystem.
+        eprintln!("[hermes-setup] could not create log dir {dir:?}: {err}");
+        return None;
+    }
+
+    let file_appender = tracing_appender::rolling::never(&dir, "bootstrap-installer.log");
+    let (non_blocking, guard) = tracing_appender::non_blocking(file_appender);
+
+    let env_filter = tracing_subscriber::EnvFilter::try_from_env("HERMES_BOOTSTRAP_LOG")
+        .unwrap_or_else(|_| tracing_subscriber::EnvFilter::new("info"));
+
+    tracing_subscriber::fmt()
+        .with_env_filter(env_filter)
+        .with_writer(non_blocking)
+        .with_ansi(false)
+        .with_target(true)
+        .init();
+
+    Some(guard)
+}
+
+// ---------------------------------------------------------------------------
+// Tauri commands
+// ---------------------------------------------------------------------------
+
+#[tauri::command]
+pub fn get_log_path() -> String {
+    log_path().to_string_lossy().into_owned()
+}
+
+#[tauri::command]
+pub fn get_hermes_home() -> String {
+    hermes_home().to_string_lossy().into_owned()
+}
+
+#[tauri::command]
+pub fn open_log_dir(app: tauri::AppHandle) -> Result<(), String> {
+    use tauri_plugin_opener::OpenerExt;
+    let path = log_dir();
+    app.opener()
+        .open_path(path.to_string_lossy(), None::<&str>)
+        .map_err(|e| e.to_string())
+}

apps/bootstrap-installer/src-tauri/src/powershell.rs

@@ -0,0 +1,357 @@
+//! Drives PowerShell (Windows) or bash (Unix) for install.ps1 / install.sh.
+//!
+//! Port of `spawnPowerShell` from bootstrap-runner.cjs, with the same
+//! line-buffered stdout/stderr streaming + cancellation semantics.
+//!
+//! On Windows we pass `-NoProfile -ExecutionPolicy Bypass -File <script>`.
+//! On Unix we shell out to `bash <script>` since install.sh expects bash.
+
+use anyhow::{Context, Result};
+use std::path::Path;
+use std::process::Stdio;
+use tokio::io::{AsyncBufReadExt, BufReader};
+use tokio::process::{Child, Command};
+use tokio::sync::mpsc;
+
+/// Hooks the caller installs to receive output.
+pub struct StreamSink {
+    pub on_stdout_line: Box<dyn Fn(&str) + Send + Sync>,
+    pub on_stderr_line: Box<dyn Fn(&str) + Send + Sync>,
+}
+
+/// Outcome of a script invocation. Mirrors bootstrap-runner.cjs's
+/// `{stdout, stderr, code, signal, killed}` shape.
+#[derive(Debug)]
+pub struct ScriptResult {
+    pub stdout: String,
+    pub stderr: String,
+    pub exit_code: Option<i32>,
+    pub killed: bool,
+}
+
+/// Cancellation signal — `cancel_tx.send(()).await` aborts the running script.
+pub type CancelRx = mpsc::Receiver<()>;
+
+/// Spawns install.ps1 / install.sh with the given args and streams output.
+///
+/// `hermes_home_override` propagates to the child as $HERMES_HOME so the
+/// install script writes to the same directory the installer is reading from.
+pub async fn run_script(
+    script_path: &Path,
+    args: &[String],
+    sink: StreamSink,
+    hermes_home_override: Option<&str>,
+    mut cancel_rx: Option<CancelRx>,
+) -> Result<ScriptResult> {
+    let mut cmd = build_command(script_path, args);
+
+    // The installer can be launched from a .app bundle that is later replaced
+    // during self-update. Pin child scripts to a stable directory so bash/zsh
+    // never starts from a deleted cwd and emits getcwd/job-working-directory
+    // errors at the end of an otherwise successful install.
+    if let Some(cwd) = stable_script_cwd(script_path, hermes_home_override) {
+        cmd.current_dir(cwd);
+    }
+
+    if let Some(home) = hermes_home_override {
+        cmd.env("HERMES_HOME", home);
+    }
+
+    cmd.stdin(Stdio::null())
+        .stdout(Stdio::piped())
+        .stderr(Stdio::piped());
+
+    // On Windows, avoid spawning a flashing cmd window when we're hosted
+    // inside a GUI process. Tauri's main window is already created, so
+    // the side-effect console for the child is unwanted.
+    #[cfg(target_os = "windows")]
+    {
+        // CREATE_NO_WINDOW = 0x08000000
+        cmd.creation_flags(0x0800_0000);
+    }
+
+    let mut child: Child = cmd
+        .spawn()
+        .with_context(|| format!("spawning {} via {}", script_path.display(), interpreter_label()))?;
+
+    let stdout = child.stdout.take().expect("stdout was piped");
+    let stderr = child.stderr.take().expect("stderr was piped");
+
+    let mut stdout_reader = BufReader::new(stdout).lines();
+    let mut stderr_reader = BufReader::new(stderr).lines();
+
+    let mut combined_stdout = String::new();
+    let mut combined_stderr = String::new();
+    let mut killed = false;
+
+    // Loop: poll stdout, stderr, cancel, and child exit concurrently.
+    loop {
+        tokio::select! {
+            line = stdout_reader.next_line() => {
+                match line {
+                    Ok(Some(l)) => {
+                        (sink.on_stdout_line)(&l);
+                        combined_stdout.push_str(&l);
+                        combined_stdout.push('\n');
+                    }
+                    Ok(None) => {
+                        // EOF on stdout — wait for stderr + exit.
+                        break;
+                    }
+                    Err(e) => {
+                        tracing::warn!("stdout read error: {e}");
+                        break;
+                    }
+                }
+            }
+            line = stderr_reader.next_line() => {
+                match line {
+                    Ok(Some(l)) => {
+                        (sink.on_stderr_line)(&l);
+                        combined_stderr.push_str(&l);
+                        combined_stderr.push('\n');
+                    }
+                    Ok(None) => {
+                        // stderr EOF — keep draining stdout.
+                    }
+                    Err(e) => {
+                        tracing::warn!("stderr read error: {e}");
+                    }
+                }
+            }
+            _ = recv_cancel(&mut cancel_rx) => {
+                tracing::warn!("cancellation received — killing child");
+                killed = true;
+                // best-effort kill; don't propagate errors
+                let _ = child.start_kill();
+                break;
+            }
+        }
+    }
+
+    // Drain remaining lines after the loop exited.
+    while let Ok(Some(l)) = stdout_reader.next_line().await {
+        (sink.on_stdout_line)(&l);
+        combined_stdout.push_str(&l);
+        combined_stdout.push('\n');
+    }
+    while let Ok(Some(l)) = stderr_reader.next_line().await {
+        (sink.on_stderr_line)(&l);
+        combined_stderr.push_str(&l);
+        combined_stderr.push('\n');
+    }
+
+    let status = child
+        .wait()
+        .await
+        .context("waiting for install script to exit")?;
+
+    Ok(ScriptResult {
+        stdout: combined_stdout,
+        stderr: combined_stderr,
+        exit_code: status.code(),
+        killed,
+    })
+}
+
+fn stable_script_cwd<'a>(script_path: &'a Path, hermes_home_override: Option<&'a str>) -> Option<&'a Path> {
+    if let Some(home) = hermes_home_override {
+        let path = Path::new(home);
+        if path.is_dir() {
+            return Some(path);
+        }
+    }
+    script_path.parent().filter(|p| p.is_dir())
+}
+
+async fn recv_cancel(rx: &mut Option<CancelRx>) {
+    match rx {
+        Some(r) => {
+            let _ = r.recv().await;
+        }
+        None => std::future::pending::<()>().await,
+    }
+}
+
+#[cfg(target_os = "windows")]
+fn build_command(script_path: &Path, args: &[String]) -> Command {
+    // We want PowerShell 5.1 / 7. install.ps1 uses 5.1-safe syntax everywhere.
+    // Prefer `powershell.exe` (5.1 baseline, present on every Windows since 7)
+    // over `pwsh.exe` (7+, may not be present). Resolve it by absolute path —
+    // see `windows_powershell_exe`.
+    let mut cmd = Command::new(windows_powershell_exe());
+    cmd.arg("-NoProfile");
+    cmd.arg("-ExecutionPolicy").arg("Bypass");
+    cmd.arg("-File").arg(script_path);
+    for a in args {
+        cmd.arg(a);
+    }
+    cmd
+}
+
+#[cfg(not(target_os = "windows"))]
+fn build_command(script_path: &Path, args: &[String]) -> Command {
+    // install.sh expects bash. /bin/bash is fine on macOS (Apple still
+    // ships an old 3.2 bash; install.sh is written to that baseline).
+    let mut cmd = Command::new("bash");
+    cmd.arg(script_path);
+    for a in args {
+        cmd.arg(a);
+    }
+    cmd
+}
+
+/// Canonical PowerShell 5.1 location under a Windows root (`%SystemRoot%`).
+/// Kept separate (and test-visible) so the path layout is unit-tested on any
+/// host, not just Windows.
+#[cfg(any(target_os = "windows", test))]
+fn powershell_under_root(root: &Path) -> std::path::PathBuf {
+    root.join("System32")
+        .join("WindowsPowerShell")
+        .join("v1.0")
+        .join("powershell.exe")
+}
+
+/// Resolves the PowerShell interpreter to spawn.
+///
+/// `Command::new("powershell.exe")` trusts PATH to contain
+/// `%SystemRoot%\System32\WindowsPowerShell\v1.0`. On machines whose PATH was
+/// trimmed or truncated (Windows silently drops entries once the variable grows
+/// past its length limit), that lookup fails and the spawn dies with
+/// "program not found" before install.ps1 ever runs — the installer then stalls
+/// at "0 of 0 steps". Resolve by absolute path first, then fall back to PATH
+/// (powershell 5.1, then pwsh 7), then a bare name as a last resort.
+#[cfg(target_os = "windows")]
+fn windows_powershell_exe() -> std::path::PathBuf {
+    for var in ["SystemRoot", "windir"] {
+        if let Ok(root) = std::env::var(var) {
+            let candidate = powershell_under_root(Path::new(&root));
+            if candidate.is_file() {
+                return candidate;
+            }
+        }
+    }
+
+    for exe in ["powershell.exe", "pwsh.exe"] {
+        if let Ok(found) = which::which(exe) {
+            return found;
+        }
+    }
+
+    std::path::PathBuf::from("powershell.exe")
+}
+
+/// Human-readable interpreter name for spawn-failure context. On Windows this
+/// is the resolved PowerShell path so a missing/odd interpreter is obvious in
+/// the log (the old message only printed the script path, which read as if the
+/// .ps1 itself was missing).
+#[cfg(target_os = "windows")]
+fn interpreter_label() -> String {
+    windows_powershell_exe().display().to_string()
+}
+
+#[cfg(not(target_os = "windows"))]
+fn interpreter_label() -> String {
+    "bash".to_string()
+}
+
+/// Parses the LAST line of stdout that looks like a JSON object matching
+/// the install.ps1 stage-result contract: `{ok: bool, stage: string, ...}`.
+///
+/// Mirrors `parseStageResult` from bootstrap-runner.cjs. install.ps1 may
+/// print info/banner lines before the result frame; we scan from the end.
+pub fn parse_stage_result(stdout: &str) -> Option<crate::events::StageResultPayload> {
+    for line in stdout.lines().rev() {
+        let trimmed = line.trim();
+        if trimmed.is_empty() {
+            continue;
+        }
+        if let Ok(value) = serde_json::from_str::<serde_json::Value>(trimmed) {
+            if value.get("ok").and_then(|v| v.as_bool()).is_some()
+                && value.get("stage").and_then(|v| v.as_str()).is_some()
+            {
+                if let Ok(parsed) =
+                    serde_json::from_value::<crate::events::StageResultPayload>(value)
+                {
+                    return Some(parsed);
+                }
+            }
+        }
+    }
+    None
+}
+
+/// Same logic but for the `-Manifest` payload (the LAST line with a `stages`
+/// array). Returns the parsed manifest.
+pub fn parse_manifest(stdout: &str) -> Option<crate::events::Manifest> {
+    for line in stdout.lines().rev() {
+        let trimmed = line.trim();
+        if trimmed.is_empty() {
+            continue;
+        }
+        if let Ok(value) = serde_json::from_str::<serde_json::Value>(trimmed) {
+            if value.get("stages").and_then(|v| v.as_array()).is_some() {
+                if let Ok(parsed) = serde_json::from_value::<crate::events::Manifest>(value) {
+                    return Some(parsed);
+                }
+            }
+        }
+    }
+    None
+}
+
+#[cfg(target_os = "windows")]
+use std::os::windows::process::CommandExt;
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn parse_stage_result_picks_last_json_line() {
+        let stdout = r#"
+[bootstrap] some info
+{"ok": false, "stage": "venv", "reason": "bad python"}
+{"ok": true, "stage": "venv"}
+final non-json banner
+"#;
+        let result = parse_stage_result(stdout).unwrap();
+        assert_eq!(result.stage, "venv");
+        assert!(result.ok);
+    }
+
+    #[test]
+    fn parse_manifest_finds_stages_array() {
+        let stdout = r#"
+info line
+{"stages": [{"name": "uv", "title": "uv", "category": "prereqs", "needs_user_input": false}], "protocol_version": 1}
+"#;
+        let m = parse_manifest(stdout).unwrap();
+        assert_eq!(m.stages.len(), 1);
+        assert_eq!(m.stages[0].name, "uv");
+        assert_eq!(m.protocol_version, Some(1));
+    }
+
+    #[test]
+    fn parse_returns_none_when_no_match() {
+        assert!(parse_stage_result("just banner\n").is_none());
+        assert!(parse_manifest("just banner\n").is_none());
+    }
+
+    #[test]
+    fn stable_script_cwd_prefers_existing_hermes_home() {
+        let script = Path::new("/tmp/install.sh");
+        let cwd = stable_script_cwd(script, Some("/"));
+        assert_eq!(cwd, Some(Path::new("/")));
+    }
+
+    #[test]
+    fn powershell_under_root_uses_system32_v1_layout() {
+        let resolved = powershell_under_root(Path::new("C:\\Windows"));
+        let normalized = resolved.to_string_lossy().replace('\\', "/");
+        assert!(
+            normalized.ends_with("System32/WindowsPowerShell/v1.0/powershell.exe"),
+            "unexpected powershell path: {normalized}"
+        );
+    }
+}