Export agent evidence as portable Playwright checks

[codeswithroh]

What changed

• capture structured replay commands during agent bug sessions
• expose evidence counts, local files, and ticket-ready Markdown reports
• export observed steps as reviewable Playwright TypeScript without model calls at run time
• document Reddit competitor research and update the release site for 0.3.0

Verification

• pnpm check: 66 tests across 16 files
• pnpm test:e2e: 10 Electron journeys
• pnpm test:site: desktop and mobile Chromium
• packaged MCP journey: unpacked app and read-only mounted DMG
• codesign --verify --deep --strict and hdiutil verify

Distribution boundary

The app is ad-hoc signed but not Apple Developer ID signed or notarized.