phase: 06_realtime_websocket_protocol

All green. Final verification complete — writing the report.

**Final pass report — phase 06 `realtime_websocket_protocol`**

- Verified: all 6 task files present in `complete/`; this was the final verification pass (no implementation work outstanding)
- `uv run ruff check .` → all checks passed; `uv run pyright` → 0 errors
- `uv run undercooked-levels validate` → content OK; `uv run pytest` (full suite) → **1751 passed, 0 failed, coverage 97.30% (>90% floor)**; slow sim stage (`-m slow tests/sim --no-cov`) → 2 passed; repo hygiene clean
- App launches: `/healthz` 200, `/` 200, `/api/levels`, `/api/config`, `POST /api/rooms` (201), `/api/stats` all verified live on an ephemeral port (server cleaned up)
- Criteria: scripted client room→hello→ready→start→countdown→≥20 snaps→round — PASS (`test_ws_round_two_clients.py`); identical `round` payloads both clients — PASS (`round_a == round_b`); version mismatch → `err protocol_mismatch` + close `4400` — PASS; 64 KB refused / 4 KB boundary, 500-burst → `rate_limited` → `4404` with bounded queue, 2000 malformed + 200 handshakes within memory bound — PASS; snap ≤ 1.5 KB (4p/4o/3h) and 64×64 ≤ 4 KB, downlink ≤ 60 KB/s over 100 ticks — PASS; `docs/PROTOCOL.md` model-sync test-enforced in both directions + full-round sequence diagram present — PASS
- Docs: README.md had 3 stale spots — status section (claimed 01–05 complete, 06 pending → now 01–06 complete, 07 pending), "until phases 06/07 wire the transport" wording, and the `PROTOCOL.md` layout note ("phase 06 completes it"). All fixed. AGENTS.md verified consistent — no changes needed
- No defects found in completed phases; no live infrastructure touched

Next pending phase: `07_canvas_client_and_hud`.

tests/fixtures/levels_playable/01_first_kitchen.yaml

@@ -0,0 +1,45 @@
+# levels/01_first_kitchen.yaml — campaign level 1, the tutorial kitchen.
+# Schema: docs/LEVELS.md · validated at startup and by `undercooked-levels
+# validate`. Every '#' is wall, every station stands on walkable floor.
+
+id: 01_first_kitchen
+name: First Kitchen
+order: 1
+difficulty: 1
+time_limit: 150
+target_score: 45
+blurb: >-
+  Your first shift: grab a tomato and an onion from the shelves, chop them,
+  cook the soup, plate it, and run it to the serve window before the clock
+  runs out. One dish, one of everything, nowhere to bump into each other.
+grid:
+  - "############"
+  - "#T..C...S..#"
+  - "#..........#"
+  - "#.P......X.#"
+  - "#..........#"
+  - "#..K....O..#"
+  - "#..........#"
+  - "#..........#"
+  - "############"
+tiles:
+  "#": {kind: wall}
+  ".": {kind: floor}
+  "T": {kind: floor, station: spawn_shelf, item: tomato}
+  "O": {kind: floor, station: spawn_shelf, item: onion}
+  "C": {kind: floor, station: chop_board}
+  "S": {kind: floor, station: stove}
+  "P": {kind: floor, station: prep}
+  "X": {kind: floor, station: serve}
+  "K": {kind: floor, station: sink}
+spawns: [[2, 7], [9, 7]]
+orders:
+  pool: [soup]
+  concurrent: 1
+  spawn_interval: [16, 20]
+  deadline: 60
+hazards: []
+escalation_notes: >-
+  Tutorial baseline (PLAN §8 campaign plan): one recipe, one order at a time,
+  slowest spawn interval, longest time budget, open floor, no hazards. Every
+  later level moves at least two axes up from these numbers.