feat(repo): add scripts/dogfood-browser.sh wrapper for snap-chromium playwright (#262)

[w7-mgfcode]

Summary

• New scripts/dogfood-browser.sh wrapper that verifies snap chromium + playwright prereqs and prints the Playwright launch snippet (or execs a passed script). Source: PRP-31 system review § "Update Browser-Dogfood automation".
• One-line cross-link in docs/user-guide/getting-started.md under "If Something Goes Wrong" / before "Next Steps".
• .gitignore now excludes .ci-logs/ (per-session dogfood logs + screenshots — local-only).

Removes the rediscovery cost the maintainer has paid across 2+ recent sessions (memory [[playwright-dogfood-snap-chromium]]).

Closes #262.

Validation gates (local)

• uv run ruff check . && uv run ruff format --check . ✅
• uv run mypy app/ ✅ (276 source files, 0 issues)
• uv run pyright app/ ✅ (0 errors, 68 pre-existing warnings)
• uv run pytest -v -m "not integration" ✅ (1423 passed)
• script smoke: ./scripts/dogfood-browser.sh against this session's running uvicorn :8123 + vite :5173 ✅

Test plan

• CI checks green on dev (Lint & Format, Type Check, Test, Migration Check)
• One reviewer
• Merge via the web UI

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