(CODUX-131) Add docs page E2E smoke

[numnx]

🧩 Task: Add docs page E2E smoke

Automated task PR opened by Code UX for T03.

📋 Summary

Sprint: Sprint 1 · Fix Electron docs page · Task: T03

Fix the Electron Docs page 404 by ensuring packaged runtime docs assets are available, and add CI-covered smoke checks for the main Docs route plus representative documentation pages.

🤖 Model & Provider

Provider	Codex CLI
Model	gpt-5.5

⏱️ Timing

Started	2026-07-09 16:40:08 UTC
Finished	2026-07-09 16:45:41 UTC
Duration	5m 33s

📊 Token Usage

Metric	Value
Input tokens	65,790
Cached input tokens	791,808
Output tokens	6,954
Total tokens	864,552
Invocations	1
Tool calls	41
Active time	3m 45s

✅ QA Review

⏳ QA review runs after this PR is opened. Check the task card in the dashboard for the outcome once it lands.

📝 Full Task Prompt

## Objective
Add CI-covered browser smoke coverage for the dashboard Docs page so the main docs index and representative docs pages cannot silently regress to 404.

## Scope
- `tests/e2e/navigation/docs-page.spec.ts` to create
- Existing helpers from `tests/e2e/helpers/prepare-app.ts` or `tests/e2e/helpers/e2e-fixtures.ts`
- Existing Playwright `navigation` project in `playwright.config.ts`
- Routes to cover: `/docs`, `/docs/docs-overview`, `/docs/user-dashboard-overview`, `/docs/user-quickstart`, `/docs/developer-mcp-tools`, `/docs/architecture-system-overview`

## Implementation Requirements
1. Create a Playwright spec under `tests/e2e/navigation/` so it is automatically included in the existing `navigation` CI project.
2. Complete onboarding and suppress the dashboard tour using existing helpers before loading docs routes.
3. Capture page errors, console errors, and HTTP responses with status `>= 400`, then fail the test with a useful message for any unexpected error.
4. For each route, assert the main content landmark is visible, `data-testid="docs-web-page-root"` is visible, and the rendered article shows an expected heading or source-path marker for that document.
5. Keep the spec focused on the main docs page plus the requested representative samples; do not add exhaustive subpage coverage.

## Constraints
- Do not modify `.github/workflows/playwright.yml` unless the new spec is not picked up by the existing `navigation` project.
- Do not rely on visual styling selectors except stable `data-testid` roots and accessible landmarks/headings.
- Do not require provider credentials, Docker provider startup, or a real external project.
- Keep the test deterministic against the compiled local server used by Playwright.

## Verification
- Run `pnpm run build` before the E2E check if `dist/` may be stale.
- Run `pnpm exec playwright test --project=navigation tests/e2e/navigation/docs-page.spec.ts`.
- Success means all listed docs routes render content and no captured HTTP, console, or page errors occur.

🌿 Branch Info

Base: feature/sprint-COWIN-1-fix-electron-docs-page-implementation
Head: task/feature-sprint-c-t03-codex-6bfad8b3-mrdqg0a7

---

🤖 Generated by Code UX