# B-003 post-fix E2E notes (Phase 15)

**Date:** 2026-06-18  
**Backlog:** B-003 — second auto compaction missed reinject; `last compaction: none`

## Automated gate (this session)

```bash
node scripts/b003-repro.mjs   # 22 unit tests + lost-reinject.jsonl audit
npm test                      # 93 tests, all green
```

**Artifact audit:** `lost-reinject.jsonl` shows pre-fix signature — compaction #2 at `07:25:14` with `lastCompactionSource: null` after compaction #1 with `auto`. Post-fix: `ensureCompactionSourceMarked` on `session_compact` infers `auto`.

## Fixes verified by unit tests

| Area | Test file |
|------|-----------|
| Source fallback when `session_before_compact` skipped | `compaction-source-fallback.test.ts` |
| `skill-reinject:inject` counts in kept window | `kept-window.test.ts` |
| Mid-turn `sendMessage`/`steer` + dedup | `reinject-mid-turn.test.ts` |
| Each compact recalculates pending | `reinject-double-compact.test.ts` |

## Full manual RPC E2E (deferred)

Reproducing two compactions in one short RPC session (like production `gitlab-mr-review` + pi-auto-compact mid-turn) needs a long context fill or reduced `keepRecentTokens`. Checklist when LLM available:

1. `/skill-reinject on` + `debug: true` in settings
2. `/skill:…` → session until two auto compactions (second mid-turn after tool use)
3. After each compact: skill in context **or** diag shows `deliveryBranch: "steer"` / `skipped-kept`
4. `/skill-reinject` → `last compaction: auto` (not `none`)

**Status:** unit + artifact gate pass; full two-compact RPC not run in this session (same constraint as B-002 full compact path).