webreel

fix: mutex crash, missing scene URLs, and SPA probe timing

feat: discovery-driven script generation — eliminate LLM hallucinations

fix: chmod spawn-helper for node-pty PTY spawn (BUG-007)

docs: log BUG-001 (hallucinated scripts, resolved) and BUG-002 (render mutex crash, open)

feat: complete Phases 1-6 + frontend implementation plan