v2.164.0

Code Simplifier: Human Gate Workflow

Three-layer notification system for maintainer review of simplification suggestions:

1. Labels -- issues created with simplification-debt + needs-maintainer-review. Pulse skips these until maintainer approves (swaps to auto-dispatch) or declines (closes with reason).
2. Assignment -- issues assigned to repo maintainer (from repos.json maintainer field or repo owner fallback). GitHub sends notification on assignment.
3. Dashboard -- /dashboard --pending-review shows all needs-maintainer-review items across pulse-enabled repos with approve/decline commands.

Full label lifecycle documented from issue creation through dispatch to completion.