# Regression Review Report

**Branch**: feat-176-tmux-abstraction-layer -> main
**Date**: 2026-05-17

## Issues in Your Changes (BLOCKING)

### CRITICAL

(none)

### HIGH

**`test:tmux` and `test:tmux:integration` not included in `test:all`** - `package.json:20`
**Confidence**: 92%
- Problem: The new `test:tmux` and `test:tmux:integration` scripts are defined but NOT included in the `test:all` aggregation script. The `test:all` script chains: `test:core && test:handlers && test:services && test:repositories && test:adapters && test:implementations && test:cli && test:dashboard && test:scheduling && test:checkpoints && test:error-scenarios && test:orchestration && test:translation && test:integration`. While tmux *unit* tests happen to run via `test:implementations` (since they live under `tests/unit/implementations/tmux/`), the tmux *integration* tests in `tests/integration/tmux/` will never run in CI because `test:integration` does NOT appear to target that path, and `test:tmux:integration` is not chained. This means CI has no coverage for the integration tests.
- Fix: Add `test:tmux:integration` to the `test:all` chain, or ensure the existing `test:integration` script covers `tests/integration/tmux/`. The integration tests already skip gracefully when tmux is unavailable, so they are CI-safe.

## Issues in Code You Touched (Should Fix)

### MEDIUM

**Duplicate test coverage between `test:implementations` and `test:tmux`** - `package.json:31-32`
**Confidence**: 85%
- Problem: `test:implementations` runs `vitest run tests/unit/implementations` which includes `tests/unit/implementations/tmux/*.test.ts` (78 tests). The new `test:tmux` script runs the exact same directory. In CI via `test:all`, these 78 tests will run once through `test:implementations`. However, developers using `test:tmux` and then `test:implementations` will run them twice. This is not a functional regression but wastes CI time if both are ever chained, and creates confusion about which script is the canonical one for tmux unit tests.
- Fix: Either (a) add `--exclude='**/tmux/**'` to `test:implementations` and add `test:tmux` to `test:all`, or (b) document that `test:tmux` is a developer convenience script only, with `test:implementations` being the CI path. Option (a) is cleaner since it follows the project's pattern of explicitly scoping test scripts.

## Pre-existing Issues (Not Blocking)

(none)

## Suggestions (Lower Confidence)

- **`test:all` script fragile to new test directories** - `package.json:20` (Confidence: 65%) -- As new feature directories are added under `tests/integration/`, they may not be picked up by any existing `test:*` script. A glob-based catch-all or explicit audit of test paths at release time would prevent silent coverage gaps.

## Summary
| Category | CRITICAL | HIGH | MEDIUM | LOW |
|----------|----------|------|--------|-----|
| Blocking | 0 | 1 | 0 | 0 |
| Should Fix | 0 | 0 | 1 | 0 |
| Pre-existing | 0 | 0 | 0 | 0 |

**Regression Score**: 9/10
**Recommendation**: CHANGES_REQUESTED

The branch is purely additive with zero removals, zero modifications to existing logic, and zero changes to existing exports. The `src/core/errors.ts` modification appends new string enum values at the end of the enum, which is backward-compatible for TypeScript string enums. No existing code imports from the new tmux module. The sole blocking issue is a CI coverage gap where tmux integration tests will never run in CI (they are defined but not wired into `test:all`). The integration tests are CI-safe (they skip when tmux is unavailable), so wiring them in is low-risk.

No decisions or pitfalls from DECISIONS_CONTEXT apply to this change. PF-001 (do not defer review issues) is noted but no issues are being deferred here. PF-002 (no backward-compat for unpublished features) does not apply since this is new additive code with no migration paths.
