## Post-Release Assessment — v3.51.0

### 1. Coherence Measurement
- **Baseline:** v3.50.0 — α A+, β A+, γ A+
- **This release:** v3.51.0 — α A, β A, γ A-
- **Delta:** α held (all ACs met, tests prove pipeline). β held (build/restore exchange real data, T-004 tightened). γ regressed slightly from A+ to A- (40% mechanical ratio exceeds 20% threshold, shared-identity review).
- **Coherence contract closed?** Yes — the distribution pipeline incoherence (#227) is closed. Build and restore modules now exchange real data end-to-end. The one design-scope deferral (#230, version upgrade skip) is explicitly tracked.

### 2. Encoding Lag
| Issue | Title | Type | Design | Impl | Lag |
|-------|-------|------|--------|------|-----|
| #226 | Package command discovery + dispatch | feature | in #228 sprint | not started | growing |
| #230 | Version upgrade skip in restore | feature | in issue | not started | low |
| #224 | Layout migration remaining ACs | feature | converged | partial | low |
| #193 | Encoding lag (orchestrator runtime) | feature | converged | not started | growing |
| #186 | Core slimming / package restructuring | feature | design shipped | not started | growing |
| #181 | Remote package index / gh-pages | feature | converged | not started | growing |
| #175 | Encoding lag | feature | converged | not started | stale |

**MCI/MCA balance:** Freeze MCI — 4 issues at growing lag. No new design docs until backlog reduced.
**Rationale:** MVA sprint (#228) is the vehicle for reducing implementation lag. Step 1+2 done (this release), Step 3 (#226) is next.

### 3. Process Learning
**What went wrong:** 40% mechanical finding ratio (2/5 findings were mechanical: non-deterministic map iteration in lockfile generation, stale package doc comment). Both should have been caught by the author — deterministic output is eng/go §2.13, stale comments are a self-coherence check.
**What went right:** Review caught a subtle architectural implication (F3: version-less VendorPath breaks the restore skip check for upgrades) that the author didn't address. The design-scope deferral with filed issue (#230) is the correct resolution — upgrade semantics are outside #227's scope but now tracked.
**Skill patches:** None needed — eng/go §2.13 already covers deterministic output. The author didn't apply it; the skill isn't underspecified.
**Active skill re-evaluation:** eng/go §2.13 (stable ordering) — application gap, not skill gap. Review skill §2.2.9 (module-truth audit) — correctly caught F3. No skill patches needed.
**CDD improvement disposition:** No patch needed — both mechanical findings have existing coverage in eng/go. The application gap is a one-time miss, not a recurring pattern.

### 4. Review Quality
**PRs this cycle:** 1 (PR #229)
**Avg review rounds:** 2 (target: ≤2 for code PRs) — on target
**Superseded PRs:** 0 (target: 0)
**Finding breakdown:** 2 mechanical / 3 judgment / 5 total
**Mechanical ratio:** 40% (threshold: 20%)
**Action:** Not filing a process issue — both mechanical findings (map sort, stale comment) have existing skill coverage (eng/go §2.13, self-coherence check). This was an application gap on one cycle, not a recurring pattern. Will monitor in next cycle.

### 4a. CDD Self-Coherence
- **CDD α:** 4/4 — All required artifacts present: design doc, self-coherence, CDD trace, tests, code, review.
- **CDD β:** 4/4 — CHANGELOG, RELEASE.md, PR body, assessment, and design doc agree on scope and findings.
- **CDD γ:** 3/4 — Review rounds on target (2), but shared-identity review (same GitHub account for author and reviewer) weakens independence. 40% mechanical ratio.
- **Weakest axis:** γ
- **Action:** None — shared identity is tracked in #45. Mechanical ratio monitored.

### 5. Production Verification

**Scenario:** Build packages from source and restore them into a clean hub.
**Before this release:** `cn build` and `cn deps restore` existed but had never exchanged real data. Three format mismatches prevented the pipeline from working.
**After this release:** `cn build → cn deps lock → cn deps restore` round-trip works end-to-end.
**How to verify:** `go test ./src/go/internal/restore/ -run TestBuildRestoreRoundTrip` — builds test packages, generates index+lockfile, restores locally, verifies content + SHA-256.
**Result:** Pass — test runs green in CI and locally.

### 6. CDD Closeout

| Step | Artifact | Skills loaded | Decision |
|------|----------|--------------|----------|
| 11 Observe | CI green, tests pass, pipeline works | post-release | runtime/design alignment confirmed |
| 12 Assess | POST-RELEASE-ASSESSMENT.md | post-release | assessment completed |
| 13 Close | #230 filed, #228 updated | post-release | cycle closed, deferred outputs committed |

### 6a. Invariants Check

| Constraint | Touched? | Status |
|---|---|---|
| INV-001 (one package substrate) | Yes — pipeline proved | preserved |
| T-002 (cli/ dispatch boundary) | Yes — `cn deps lock` dispatch | preserved |
| T-003 (Go sole language) | Yes — all changes in Go | preserved |
| T-004 (source/artifact/installed) | Yes — VendorPath fixed | tightened |

### 7. Next Move
**Next MCA:** #226 — Package command discovery + dispatch (MVA Step 3)
**Owner:** next available agent
**Branch:** pending branch creation
**First AC:** `cn daily` dispatches to cnos.core package command entrypoint
**MCI frozen until shipped?** Yes
**Rationale:** MVA sprint (#228) is reducing implementation lag. 4 issues at growing lag. Step 3 depends on Step 1+2 (done).

**Closure evidence (CDD §10):**
- Immediate outputs executed: yes
  - CHANGELOG updated (this commit)
  - RELEASE.md written (this commit)
  - POST-RELEASE-ASSESSMENT.md written (this commit)
  - #228 updated with Step 1+2 completion
- Deferred outputs committed: yes
  - #230 filed (version upgrade skip) — P1
  - #226 next MCA (command discovery)

**Immediate fixes** (executed in this session):
- None required — no skill patches needed.

### 8. Hub Memory
- **Daily reflection:** deferred — no hub repo access in this session
- **Adhoc thread(s) updated:** deferred — no hub repo access in this session

Note: P-003 (hub memory closes substantial release cycles) requires hub repo access. This assessment documents the deferral explicitly. The next session must complete hub memory writes before starting new work.
