phase: 07_canvas_client_and_hud

**Final report — phase 07 final verification pass**

- **Verified:** all 5 tasks present in `complete/`; app boots (`/healthz` 200, `/` 200, static + atlas + `/api/levels` served); `docs/CLIENT.md` module map matches the on-disk `app/static/` tree; no code defects found.
- **Tests/lint/coverage:** `bash .agents/validate.sh` → ruff clean, pyright 0 errors, `undercooked-levels validate` pass, **full pytest 1838 passed, 97.21% coverage (floor 90%)**, slow sim stage 2 passed, repo hygiene clean. `uv run pytest tests/e2e -q` → **53 passed** (all 8 suites added this phase).
- **Criteria:** (1) two tabs create→join→ready→start→serve one dish, keyboard only — green via `test_us01/02/03/04` ✔; (2) e2e green ✔; (3) canvas non-blank, pixels change after a move — `test_us04_render_smoke` ✔; (4) HUD score within 200 ms of the `served` event — asserted, green ✔; (5) zero console errors + zero off-origin requests — `test_atlas_loads` / `test_us01_landing_surface` ✔; (6) `docs/CLIENT.md` matches layout ✔; (7) 100% suite + 97.21% ✔; (8) docs pass below ✔; (9) no regression in completed phases (all prior suites green) ✔.
- **README.md fixed:** status still said "next pending phase is 07" → now 07 complete, 08 pending; the phase-07 client text buried in the phase-05 bullet → its own "canvas client, art, HUD (phase 07)" bullet; stale "What does not exist yet" (claimed movement/controls missing) → rewritten to phases 08–14; "once the room flow ships" → "live in the browser today"; Layout `app/static/` "renderer arrives with the rest of phase 07" → full shipped-client map; Layout `docs/` "CLIENT lands with phase 07" → `CLIENT.md` listed; added `gen_art_index.py` Layout entry.
- **AGENTS.md fixed:** "the eight screens" (7 listed) → "the seven screens" (+ `dom.js` is the shared builder, not a screen); e2e naming line → notes the non-story guard `test_atlas_loads.py`.
- **Decisions:** no code changes were needed; only the two doc fixes above. Docs re-verified by `test_docs_commands`/`test_docs_index` (44 passed) plus the final full gate.
- **Next pending phase:** `08_client_prediction_and_touch`.

tests/unit/test_harness.py

@@ -18,6 +18,12 @@ REPO_ROOT = Path(__file__).resolve().parents[2]
 HARNESS_MARKERS = ("unit", "integration", "e2e", "slow")
 TEST_SUBDIRS = ("unit", "integration", "sim", "e2e")
 
+#: The technical e2e suites that a phase file names but that belong to no
+#: single user story (e.g. the phase-07 art/atlas guard). Every entry is a
+#: deliberate, named exception to the story-naming contract in
+#: `tests/e2e/README.md`; a new technical suite lands here first.
+E2E_TECHNICAL_SUITES = frozenset({"test_atlas_loads.py"})
+
 
 def test_package_metadata() -> None:
     assert undercooked.__version__ == "0.1.0"
@@ -59,12 +65,14 @@ def test_fixture_levels_dir_exists(isolated_levels_dir: None) -> None:
 
 
 def test_e2e_tests_follow_the_story_naming_convention() -> None:
-    """`pytest -m e2e --collect-only` selects only `test_usNN_*.py` story suites.
+    """`pytest -m e2e --collect-only` selects story suites (`test_usNN_*.py`) and
+    the allowlisted technical suites only.
 
-    Task 01 could only assert "the marker collects nothing yet". Now that the first
-    browser suite exists the durable invariant is the naming contract in
-    `tests/e2e/README.md`: a story suite that is not named for its story is one that
-    nobody can find, and one that cannot be collected is one that never runs.
+    The durable invariant is the naming contract in `tests/e2e/README.md`: a
+    story suite that is not named for its story is one that nobody can find,
+    and a suite that cannot be collected is one that never runs. Technical
+    suites (guards for a phase's machinery, named by the phase files) are
+    the documented exception, tracked in `E2E_TECHNICAL_SUITES`.
     """
     result = subprocess.run(  # fixed argv, repo's own interpreter
         [
@@ -92,4 +100,5 @@ def test_e2e_tests_follow_the_story_naming_convention() -> None:
     assert files, f"the e2e marker selected nothing:\n{result.stdout}"
     for path in files:
         assert path.startswith("tests/e2e/"), path
-        assert re.fullmatch(r"test_us\d{2}_.+\.py", Path(path).name), path
+        name = Path(path).name
+        assert re.fullmatch(r"test_us\d{2}_.+\.py", name) or name in E2E_TECHNICAL_SUITES, path