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solitaire_server/e2e/: - smoke.spec.js: verifies /play-classic loads, exposes window.__FERROUS_DEBUG__ bridge, keyboard parity (Space=draw, U=undo), debug failure report, and replay payload builder exports schema-v2 moves. - gameplay_review.spec.js: HUD/controls render check, stock-click + undo player flow, draw-mode toggle, autonomous play invariant batch, and cycle-detection regression guard. - cycle_metrics.js: headless cycle-rate analysis tool; run via `npm run review:cycles` with configurable policy, game count, and thresholds. Regression gate baked into package.json scripts. - playwright.config.js: targets the local server at http://localhost:8080. - package.json / package-lock.json: @playwright/test 1.60.0. .gitea/workflows/web-e2e.yml: - Runs on pushes to solitaire_server/, solitaire_wasm/, solitaire_core/, or Cargo changes. Starts the server binary, waits for /health, runs the full Playwright suite, uploads test-results/ on failure. docs/testing-architecture.md: documents the three-tier test strategy (unit → Playwright smoke → cycle regression) and the __FERROUS_DEBUG__ bridge contract. scripts/update_quaternions_deps.sh: helper to bump the Quaternions registry deps (klondike, card_game) by version and run the full safety gate including deterministic replay checks. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>