# Structural Snapshot — 2026-05-13 (Phase B Cycle 4 close)

**Cycle**: Phase B, cycle 4 (`state.cycle = 4`)
**Source-of-truth files**: `_docs/02_document/module-layout.md`, `_docs/02_document/architecture_compliance_baseline.md`, `scripts/check-arch-imports.mjs`, `scripts/run-tests.sh`, `src/api/endpoints.test.ts`.
**Previous snapshot**: `_docs/06_metrics/structure_2026-05-13.md` (Phase B cycle 3 close).

> Cycle 4 was a single-task, contained UI-feature cycle (AZ-512 admin class inline edit). It introduced **no new components**, **no new gates**, **no new barrels**, **no new wire-contract assertions**, and **no new architecture findings**. The structural snapshot is therefore a near-identity copy of cycle 3 close with two non-structural deltas: test count (+12) and bundle size (+757 B).

## Component Inventory

| Metric | Cycle 1 close | Cycle 3 close | Cycle 4 close | Δ vs cycle 3 |
|--------|---------------|---------------|---------------|--------------|
| Component count | 12 | 12 | 12 | 0 |
| Components with Public API barrels | 11 | 11 | 11 | 0 |
| Barrel coverage (eligible components) | 100 % | 100 % | 100 % | 0 |
| Documented feature→feature edges (grandfathered) | 1 | 1 | 1 | 0 |
| Documented STC-ARCH-01 carve-out exemptions | 1 | 0 | 0 | 0 (held at zero) |
| Cycles in component import graph | 0 | 0 | 0 | 0 |

## Architecture Gates (cycle 4 close)

| Gate | Added in | Enforces | Status (cycle 4 close) |
|------|----------|----------|------------------------|
| `STC-ARCH-01` | Cycle 1 / AZ-485 | No cross-component deep imports; barrels are the Public API | PASS (zero exemptions — held since cycle 3) |
| `STC-ARCH-02` | Cycle 1 / AZ-486 | No hardcoded `/api/<service>/...` literals in production source | PASS |
| `STC-SEC1C` | Cycle 2 / AZ-499 | Banned literal: OpenWeatherMap key | PASS |
| `STC-SEC1D` | Cycle 2 / AZ-501 | Banned literal: Google Geocode key | PASS |
| `FT-P-22` (key parity) | (i18n coverage gate) | `en.json` ↔ `ua.json` key parity | PASS (extended cycle 4: covers `admin.classes.{title,edit,save,cancel,nameRequired,maxSizeMustBePositive,updateFailed}`) |
| `FT-P-23` (no hardcoded strings) | (i18n coverage gate) | No raw English strings outside i18n bundles | PASS (the aria-label-as-hardcoded-English failure during cycle-4 implementation was caught by this gate and fixed before commit — see batch_16_cycle4_report.md "Pre-existing bug noted") |

Total commit-time static gates: **33** (cycle 3 close = 33; cycle 4 close = 33 — no new gates this cycle, **all existing gates green**).

## Architecture Baseline Delta vs `architecture_compliance_baseline.md`

| Finding | Category | Cycle 1 close | Cycle 2 close | Cycle 3 close | Cycle 4 close |
|---------|----------|---------------|---------------|---------------|---------------|
| F1 — mission-planner vs flights duplication | Architecture | Open | Open | Open | Open |
| F2 — cross-feature edge `07_dataset → 06_annotations` | Architecture | Open (grandfathered) | Open | Open | Open |
| F3 — classColors physical/logical owner split | Architecture | Open | Open | RESOLVED (AZ-511) | RESOLVED |
| F4 — No Public API barrels | Architecture | RESOLVED (AZ-485) | RESOLVED | RESOLVED | RESOLVED |
| F5 — Pre-existing cycle inside `mission-planner` | Architecture | Open | Open | Open | Open |
| F6 — No `src/shared/` | Architecture | Open | Open | Open | Open |
| F7 — Hardcoded `/api/<service>/` literals | Architecture | RESOLVED (AZ-486) | RESOLVED | RESOLVED | RESOLVED |
| F8 — Layering-table inconsistency | Architecture | Open | Open | Open | Open |
| F9 — Inert second Vite entry tree | Architecture | Open | Open | Open | Open |

- **Resolved this cycle**: 0
- **Newly introduced this cycle**: 0
- **Architecture findings open at cycle 4 close**: 6 of 9 baseline (F1, F2, F5, F6, F8, F9) — unchanged
- **Net architecture delta cycle 4**: 0 (no movement)

## Contract Coverage

- `_docs/02_document/contracts/` does NOT exist; project uses **code-derived contracts pattern** via `src/api/endpoints.test.ts`.
- Wire-contract assertions count: cycle 1 = 36, cycle 2 = 36, cycle 3 = 37, cycle 4 = **37** (no change — AZ-512 reused the existing `endpoints.admin.class(id)` builder for PATCH; no new builder introduced per task constraint).

## Test Suite Snapshot

| Profile | Cycle 1 close | Cycle 2 close | Cycle 3 close | Cycle 4 close | Δ vs cycle 3 |
|---------|---------------|---------------|---------------|---------------|--------------|
| Fast (count) | 209 PASS / 13 SKIP / 0 FAIL | 229 PASS / 13 SKIP / 0 FAIL | 231 PASS / 13 SKIP / 0 FAIL | **243 PASS / 13 SKIP / 0 FAIL** | **+12 PASS**, 0 SKIP |
| Static (gates) | 31 / 31 PASS | 33 / 33 PASS | 33 / 33 PASS | 33 / 33 PASS | 0 |
| Build | green | green | green | green | 0 |
| Bundle (gzipped initial JS) | not measured | 290 465 B | 290 575 B | **291 332 B** | **+757 B** (+0.26 %) |

The +12 PASS comes from `tests/admin_class_edit.test.tsx` (the entire AZ-512 suite). No other test files changed counts; `tests/destructive_ux.test.tsx`'s selector fix kept its existing 6 cases (2 fixed, 4 carried).

The +757 B bundle delta is explained at byte-level in `_docs/06_metrics/perf_2026-05-13_cycle4.md` (~500–600 B from the new `AdminPage` handlers + JSX, ~150–200 B from 7 i18n keys × 2 locales).

## Cycle 4 Source-of-Truth Mutations

| File / area | Mutation | Driver |
|-------------|----------|--------|
| `src/features/admin/AdminPage.tsx` | Inline edit state (4 hooks), 4 new handlers, conditional colspan row JSX, pencil affordance, `t('admin.classes')` → `t('admin.classes.title')` | AZ-512 |
| `src/i18n/en.json`, `src/i18n/ua.json` | `admin.classes` flat string → nested object (`title` + 6 keys for edit UI in both locales) | AZ-512 |
| `tests/msw/handlers/admin.ts` | New `http.patch('/api/admin/classes/:id', ...)` partial-merge handler | AZ-512 (test infra) |
| `tests/admin_class_edit.test.tsx` | NEW — 12 tests covering AC-1..AC-6, AC-8 | AZ-512 |
| `tests/destructive_ux.test.tsx` | Selector fix at 3 call sites (`querySelector('button')` → `Array.from(...).find(b => b.textContent === '×')`) | Adjacent hygiene from AZ-512 |
| `_docs/02_document/components/08_admin/description.md` | Edit affordance + PATCH wiring recorded | AZ-512 (spec-authorized) |
| `_docs/02_document/architecture.md` (row 272) | `08_admin/AdminPage` row gains PATCH /api/admin/classes/{id} with AZ-513 deploy-gate caveat | Step 13 (Update Docs) |
| `_docs/02_document/modules/src__features__admin__AdminPage.md` | Header cycle-4 banner; new state slots, four new handlers, layout note, PATCH integrations row, expanded i18n key list, Tests section | Step 13 (Update Docs) |
| `_docs/02_document/tests/blackbox-tests.md` | Added FT-P-62, FT-N-18 | Step 12 (Test-Spec Sync) |
| `_docs/02_document/tests/traceability-matrix.md` | O9 → Covered; references FT-P-62 + FT-N-18 + AZ-513 deploy gate | Step 12 (Test-Spec Sync) |
| `_docs/05_security/security_report_cycle4_delta.md` | NEW — cycle-4 delta; verdict PASS_WITH_WARNINGS; one new LOW finding (F-SAST-CY4-1) | Step 14 (Security Audit) |
| `_docs/05_security/security_report.md` | Cycle-4 amendment banner | Step 14 (Security Audit) |
| `_docs/06_metrics/perf_2026-05-13_cycle4.md` | NEW — NFT-PERF-01 PASS at 291 332 B | Step 15 (Performance Test) |

## Auto-lesson triggers (per skill Step 1)

- Net Architecture delta > 0? **No** — delta is 0. No `architecture` lesson trigger.
- Structural metric regression > 20%? **No** — every structural metric held at its cycle-3 value, except test count (+5.2%) and bundle (+0.26%), both improvements / within-budget.
- Contract coverage % decreased? **No** — same 37 assertions (no builder added, no builder removed).
- New finding category emerged? **No** — security audit ran in delta mode; categories are stable.

No auto-lesson triggers fired in cycle 4. Manual lessons (3 picked) appear in the retro report.