Phase 0: record merge and post-merge CI completion

[vib-tools]

Summary

This Ready PR records the completed Phase 0 merge and the successful
push-triggered Backend CI result on main.

Locked evidence

Phase 0 implementation PR: #1
Approved feature head: 06071e5f41c5b727edc620469a1c0504b7a1676b
Locked pre-merge main: b9019b79d1af3fe73d1a74769792ebb6958c4f4c
Merge commit: 6e44866de9ec3a3a745777afc12276f903259709
Merged at: 2026-07-24T15:37:52Z
Final-head PR CI: 30096212556 / 89490793519 / success
Post-merge main CI: 30106115262 / 89523839117 / success

Exact scope

AUDIT_REPORT.md
CHANGELOG.md
CONTRACT_MANIFEST.json
PROJECT_STATUS.md
README.md
VERSION.json
docs/ci/BACKEND_CI_IMPLEMENTATION_PLAN.md
docs/ci/BACKEND_CI_SPECIFICATION.md
docs/ci/BACKEND_CI_TESTING_AND_ROLLBACK_SPECIFICATION.md
docs/phase0/PHASE0_COMPLETION_RECORD.md

Boundaries

Documentation and manifests only
Runtime code change: NO
API change: NO
Database change: NO
Migration: NO
Provider execution: NO
Deployment: NO
Branch protection: NO
Auto-merge: NO
Main direct push: NO
Coolify redeploy required: NO

This PR is Ready for review following explicit authorization. It must remain
unmerged until a separate controlled merge authorization is issued.

Patch execution assurance

The creation package used an actual merged-tree transformer dry-run and
post-validation exact-scope verification before creating this PR.

Local package hygiene

The controlled runner removes only exact downloaded package artifacts after
the PR and its CI have been fully verified. Repository evidence and the
recovery bundle remain preserved outside Downloads.