# Phase 123: Closure And Regression Audit - Context

**Gathered:** 2026-04-11
**Status:** Implemented and verified
**Mode:** Milestone closeout for `v1.63`

<domain>
## Phase Boundary

Close `v1.63` with targeted regressions, maintainability-budget verification,
source-catalog acceptance, and a fresh green full-suite baseline.

</domain>

<decisions>
## Implementation Decisions

### Locked decisions

- do not claim `999.26` complete unless both import and export are real
  production paths
- keep maintainability budgets fixed
- require the existing isolated source-catalog acceptance script to cover the
  new BibTeX surface

</decisions>

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*Phase: 123-closure-and-regression-audit*
*Context captured on 2026-04-11 after Phase 123 implementation and verification*
