Track four test files that were never committed

CLAUDE.md cites tests/test_model_config.py as the guard against reintroducing
retired OpenRouter model ids, but the file existed only on disk — the guard was
not in the repository. Same for the town geo, voice roster and voicemail
transcript tests, and the Reaper bleep-selection test.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

tests/test_model_config.py

@@ -0,0 +1,90 @@
+"""Guards against the two model-config failures that have bitten us:
+a routed model with no pricing entry (silently costs $0.00 on the dashboard),
+and a stale model id that 404s at the OpenRouter API."""
+
+from backend.config import settings
+from backend.services.cost_tracker import OPENROUTER_PRICING
+from backend.services.llm import OPENROUTER_MODELS, LLMService
+
+_CALLER_DIALOG_MODEL_PARAMS = LLMService._CALLER_DIALOG_MODEL_PARAMS
+
+# Retired on OpenRouter — kept here so a reintroduction fails loudly.
+RETIRED_MODELS = {
+    "anthropic/claude-3.5-haiku",
+    "anthropic/claude-3.5-sonnet",
+    "anthropic/claude-sonnet-4-5",   # note the dash; the live id uses a dot
+    "google/gemini-flash-1.5",
+    "mistralai/mistral-small-creative",
+    "x-ai/grok-4",
+    "x-ai/grok-4-fast",
+    "x-ai/grok-4.1-fast",
+}
+
+
+def test_every_routed_model_has_pricing():
+    """A routed model missing from OPENROUTER_PRICING records cost as $0.00."""
+    unpriced = {
+        cat: model
+        for cat, model in settings.category_models.items()
+        if model not in OPENROUTER_PRICING
+    }
+    assert not unpriced, f"routed models with no pricing entry: {unpriced}"
+
+
+def test_no_retired_models_are_routed():
+    routed = {
+        cat: model
+        for cat, model in settings.category_models.items()
+        if model in RETIRED_MODELS
+    }
+    assert not routed, f"category routed to a retired model: {routed}"
+
+
+def test_no_retired_models_in_the_pool():
+    stale = sorted(set(OPENROUTER_MODELS) & RETIRED_MODELS)
+    assert not stale, f"retired models still listed in OPENROUTER_MODELS: {stale}"
+
+
+def test_no_retired_models_in_caller_dialog_params():
+    stale = sorted(set(_CALLER_DIALOG_MODEL_PARAMS) & RETIRED_MODELS)
+    assert not stale, f"per-model tuning keyed to retired models: {stale}"
+
+
+def test_pool_models_are_priced():
+    """Anything selectable should be costable."""
+    unpriced = [m for m in OPENROUTER_MODELS if m not in OPENROUTER_PRICING]
+    assert not unpriced, f"pool models with no pricing entry: {unpriced}"
+
+
+def test_no_retired_model_ids_anywhere_in_the_codebase():
+    """publish_episode.py, make_clips.py and relabel_transcripts.py each shipped
+    a retired model id and only failed when someone ran them. Scan every source
+    file so the next one fails here instead.
+
+    cost_tracker.py is exempt: it intentionally keeps retired ids as pricing
+    keys so historical cost records stay costable.
+    """
+    import pathlib
+
+    root = pathlib.Path(__file__).resolve().parent.parent
+    exempt = {root / "backend" / "services" / "cost_tracker.py",
+              pathlib.Path(__file__).resolve()}
+
+    offenders = {}
+    for path in root.rglob("*.py"):
+        if path in exempt:
+            continue
+        # Skip venvs, vendored models, and git worktrees (separate checkouts
+        # on other branches — not this tree's code).
+        if any(part in {"venv", "mlx_models", ".git", ".claude", ".worktrees",
+                        "node_modules", "remotion-demo"} for part in path.parts):
+            continue
+        try:
+            text = path.read_text(encoding="utf-8", errors="ignore")
+        except OSError:
+            continue
+        hits = sorted(m for m in RETIRED_MODELS if f'"{m}"' in text or f"'{m}'" in text)
+        if hits:
+            offenders[str(path.relative_to(root))] = hits
+
+    assert not offenders, f"retired model ids still referenced: {offenders}"