# Phase 105: Closure And Regression Audit - Context

**Gathered:** 2026-04-11
**Status:** Implemented and verified
**Mode:** Final closure phase for `v1.57`

<domain>
## Phase Boundary

Close `v1.57` with targeted phase6 split coverage and a fresh full-suite
baseline.

</domain>

<decisions>
## Implementation Decisions

### Locked decisions

- close backlog `999.12` only after the full suite stays green with the new
  split
- record that `999.12` is now complete across `v1.55` through `v1.57`

</decisions>

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*Phase: 105-closure-and-regression-audit*
*Context captured on 2026-04-11 after Phase 105 implementation and verification*
