Pre-merge documentation for reviewers. Summarizes:
- What Phase 0 tasks deliver (JSON envelope contracts, regression locks)
- Why dogfood cycles #99-#105 matter (validated methodology, 15 filed pinpoints)
- Commit-by-commit navigation for the 30-commit frozen bundle
- What lands vs what's deferred
- Integration notes for Phase 1 planning
- Known limitations + follow-ups
This is doc-only, no code changes. Serves as audit trail and reviewer
reference without adding scope to the frozen feature branch.
