guardrails: plugin hardening wave 2 for MVP floor #13
Description
Parent epic: #16
Problem
The plugin MVP in #4 proves the extension surface, but it does not yet cover enough of the high-value hook migration set to support an MVP claim by itself.
Deliverables
- expand plugin policy to cover high-priority fast-feedback hooks from the migration inventory
- add crash-safe state or logging expectations where needed for local runtime continuity
- document which plugin behaviors are part of the MVP floor versus later operational hardening
Candidate scope from the inventory
- post-lint-format
- block-version-downgrade
- context-budget-*
- mark-factcheck-done and reset-factcheck
- targeted review or fact-check runtime state where feasible without broad core patches
Acceptance
- the plugin covers the highest-value remaining fast-feedback policies needed for MVP
- behavior is scenario-tested or otherwise runtime-verified
- scope remains thin-distribution-first and upstream-friendly