Phase 6.2 — RC tag + 1-week bake

[drewangell]

Plan file: docs/v4-plans/phase-6/02-rc-tag-and-bake.md

PRD: docs/PRD.md

This issue tracks execution of the plan file above. The plan file is the source of truth for scope, acceptance criteria, and verification — pick this issue up when ready to take the iteration, execute against the plan, and close when the acceptance criteria are met.

Phase 6 — Verification & RC Bake

Links above are relative paths. They resolve on main after PR #285 merges (the PR adds both the revised PRD and the docs/v4-plans/ tree).