Merge branch 'worktree-supervisor-flags'
Python supervisor + DB-backed feature flags
- supervisor.py replaces supervisor.sh (topological wave scheduling, croniter)
- workflows.toml workflow registry (5 extractors, cron presets, depends_on)
- proxy.py round-robin + sticky proxy rotation via PROXY_URLS
- Feature flags: migration 0019, is_flag_enabled(), feature_gate() decorator
- Admin /admin/flags UI with toggle (admin-only)
- lead_unlock gate on unlock_lead route
- 59 new tests (test_supervisor.py + test_feature_flags.py)
- Fix is_flag_enabled bug (fetch_one instead of execute_fetchone)
# Conflicts:
# CHANGELOG.md
# web/pyproject.toml
84229e50f7