docs(pm-dispatch): sweep of 7 measured SKILL corrections — os-regen list drift, unlock-sweep triple duty, verification blindness, auto-merge signature, metadata seat's term

Fixes #6492
Fixes #6490
Fixes #6465
Fixes #6371
Fixes #6218
Fixes #6207
Part of #6644

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01F8q5J1MQyocgtNspb15fSn

Author: claude