6435199f08
- docs/STRUCTURE.md: add a .planning/ registry (vision/roadmap/history/breakdown
roles), broaden the roadmap role, add enforcement items 8-10.
- tools/check_requirements.py: scan .planning/ too - every .planning/**.md must be
registered, registered files must exist, requirement rows rejected there.
- .planning/: PROJECT.md, ROADMAP.md, MILESTONES.md, and milestones/v0.5/M3/
{roadmap.md,task_breakdown.md}. M3 breakdown holds only the tasks; decisions live
in the contracts.
- docs/DEPLOYMENT.md: add the ops runbook (registered as ops).