[S32] chore : historical governance backfill + PR registry

[Doogie201]

Summary

• backfill machine-readable sprint contracts for S01 through S17
• add machine-readable pull request registry and lineage graph PR nodes
• update historical drift artifacts that became stale after whole-project governance backfill

Evidence

• S32 followthrough: docs/sprints/S32/evidence/followthrough_20260311_000000/
• S32-HIST-01: docs/sprints/S32/evidence/work_items/S32-HIST-01_20260311_000000/
• S32-PR-01: docs/sprints/S32/evidence/work_items/S32-PR-01_20260311_000000/

Gates

• npm run -s verify
• npm run -s lint
• npm test
• npm run -s build
• pre-commit run --all-files

[codecov]

Bundle Report

Bundle size has no change ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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