phase: 03_simulation_movement_and_interaction

**Final verification pass — phase 03 `simulation_movement_and_interaction` (all 5 task files already in `complete/`)**

- Verified all phase-03 deliverables exist and work: `sim/` kernel (`step`, `state_build`, `rng`, `movement`, `collision`, `interact`, `carry`, `replay`), replay fixtures + 3 committed goldens, `docs/SIMULATION.md`.
- `bash .agents/validate.sh` → **passed**: ruff `All checks passed!`, pyright `0 errors`, `undercooked-levels validate` green, full `pytest` **1033 passed** (coverage **99.71%** ≥ 90% floor), slow sim stage green, repo-hygiene clean.
- Perf smoke (4 players, 2 000 ticks): mean **0.049 ms/tick, 20 423 ticks/s** — ≥ 10 000 ticks/s criterion met (test lives in `test_perf_smoke.py`, which the gate's slow stage runs; the overview names it `test_replay.py`).
- Completion criteria: import `undercooked.sim.step.step` ✅ · `tests/sim` green incl. determinism + goldens ✅ · perf ✅ · constant-change-fails-by-design ✅ (committed-hash equality + mutation test naming first bad tick/field; goldens never rewritten by tests) · `docs/SIMULATION.md` ✅ (constants, 8-step order, purity/determinism, re-bless) · full suite + coverage ✅ · app launches: `/healthz` 200, `/` 200, `/api/levels` serves content ✅ · replay CLI `check walk_solo.json` exit 0 ✅ · no regression in phases 01/02 (their suites green) ✅.
- Documentation: README.md — fixed one stale inconsistency (Status opening listed only 01/02 complete with 03 pending; now lists 01–03 complete, next pending `04_kitchen_pipeline_and_scoring`); all other README claims (CLI flags, config table, shell text, replay CLI exit codes) verified against code. AGENTS.md — verified consistent with the project as it stands, no changes needed.
- No deviations. Next pending phase: **`04_kitchen_pipeline_and_scoring`**.

tests/fixtures/levels/_replay/pick_drop_pass.yaml

@@ -0,0 +1,46 @@
+# tests/fixtures/levels/_replay/pick_drop_pass.yaml — the fixture kitchen for the
+# pick_drop_pass replay golden (phase 03 task 05). Not campaign content: it is
+# loaded by `tests/sim/test_replay.py` through `load_level_file`, and the `_`
+# prefix keeps the content loader's discovery (and `undercooked-levels validate`)
+# from reading it. It carries one of every fixture kind the hand rules need —
+# a spawn shelf, a prep counter, a serve window, a trash can — and nothing a
+# golden must not depend on (no hazards, no pipeline inputs, nothing a phase-04
+# rule would reinterpret).
+# Schema: docs/LEVELS.md
+
+id: 99_replay_pick_drop_pass
+name: Replay Kitchen
+order: 99
+difficulty: 1
+time_limit: 300
+target_score: 1
+blurb: >-
+  The committed kitchen for the pick_drop_pass replay golden: one shelf, one
+  prep counter, one serve window and one trash can, open floor, two spawns.
+grid:
+  - "############"
+  - "#T.....P...#"
+  - "#..........#"
+  - "#....X.....#"
+  - "#..........#"
+  - "#..G.......#"
+  - "#..........#"
+  - "############"
+tiles:
+  "#": {kind: wall}
+  ".": {kind: floor}
+  "T": {kind: floor, station: spawn_shelf, item: tomato}
+  "P": {kind: floor, station: prep}
+  "X": {kind: floor, station: serve}
+  "G": {kind: floor, station: trash}
+spawns: [[2, 6], [9, 6]]
+orders:
+  pool: [soup]
+  concurrent: 1
+  spawn_interval: [12, 16]
+  deadline: 60
+hazards: []
+station_limits: {plates: 99, pots: 99}
+escalation_notes: >-
+  Not an authored campaign level: the fixture kitchen the pick_drop_pass replay
+  golden (phase 03 task 05) is recorded on, checked by tests/sim/test_replay.py.