fix: pipe stdio in engine.ts to suppress subprocess noise (#54)

* test: add E2E tests for engine.ts stdio piping

Verify that all execFileSync calls in engine.ts use { stdio: "pipe" }
to prevent subprocess output (uv, pip install, python --version, etc.)
from leaking into the TUI's text input area.

Tests use real subprocess calls via spawnSync to confirm the piping
behavior end-to-end, plus a source-level check that every call site
in engine.ts includes the stdio option.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: add stdio: "pipe" to all execFileSync calls in engine.ts

Without this option, subprocess output from uv, pip install, tar, and
python/uv --version leaks into the TUI's text input area. Piping stdio
suppresses this noise while still capturing the return value.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: update docs URL to GitHub Pages

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: include stderr in telemetry error messages for piped execFileSync

With stdio: "pipe", e.message is a generic "Command failed" string.
The actual diagnostics are in e.stderr, so prefer that for telemetry.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: anandgupta42

packages/altimate-code/src/bridge/engine.ts

@@ -179,7 +179,7 @@ async function ensureEngineImpl(): Promise<void> {
         timestamp: Date.now(),
         session_id: Telemetry.getContext().sessionId,
         phase: "venv_create",
-        error_message: (e?.message ?? String(e)).slice(0, 500),
+        error_message: (e?.stderr?.toString() || e?.message ?? String(e)).slice(0, 500),
       })
       throw e
     }
@@ -196,7 +196,7 @@ async function ensureEngineImpl(): Promise<void> {
       timestamp: Date.now(),
       session_id: Telemetry.getContext().sessionId,
       phase: "pip_install",
-      error_message: (e?.message ?? String(e)).slice(0, 500),
+      error_message: (e?.stderr?.toString() || e?.message ?? String(e)).slice(0, 500),
     })
     throw e
   }

packages/altimate-code/src/cli/cmd/tui/app.tsx

@@ -555,7 +555,7 @@ function App() {
       title: "Open docs",
       value: "docs.open",
       onSelect: () => {
-        open("https://altimate-code.dev/docs").catch(() => {})
+        open("https://crispy-adventure-6lj1ey3.pages.github.io/").catch(() => {})
         dialog.clear()
       },
       category: "System",