[M4] Auto-Discovery of Existing Playwright Tests

[cursor]

Milestone 4 — Playwright Test Video Integration | Priority: Low

Scan project for existing Playwright tests and suggest visual_map entries.

• Detect conftest.py with playwright imports, or playwright.config.ts
• Discover individual test files and functions
• Suggest visual_map entries based on discovered tests
• Integrate with docgen wizard and docgen init
• Handle monorepo layouts
• CLI: docgen discover-tests [--dir tests/]

See issues/playwright-test-integration/07-auto-discovery.md for full spec.