fix(tests): T-7 — the unit suite is hermetic, the flake class is gone

Three flakes in one day, never a captured name — the name finally
came from a discriminating run instead of patience: pointing
OLLAMA_HOST at a dead port failed exactly eight tests, all in
tests/agents/test_tatlock_agent.py, all already marked integration,
all running in the unit gate anyway because make test excluded by
directory and they live outside the ignored directories. Eight tests
doing ~110 seconds of real LLM inference against the production
wrapper on every unit run, failing whenever the backend was
mid-deploy — which this week it constantly was.

The second coupling sat in the session init: conftest ran the real
health probes, an HTTP round trip to whatever answers behind
OLLAMA_HOST plus a real Anthropic API call whenever the dev .env
carries a key, so the cached backend globals followed the network of
the moment. The probes are stubbed to the deterministic local-first
state; tests needing other states patch the globals themselves, as
the selector tests always did.

make test now enforces -m "not integration" alongside the directory
ignores, and the acceptance is blunt: 679 passed in ~12 s, identical
against a dead backend and no API key — down from ~129 s of
infrastructure-coupled runtime. Both prongs mutation-checked: the
gate removed fails eight against a dead backend; the stub removed
fails the new session-globals test. T-8 files the orphaned
tests/integration directory that no make target runs.

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

tests/conftest.py

@@ -49,16 +49,44 @@ def _tenant_guard():
 @pytest.fixture(scope="session", autouse=True)
 def _initialize_app(_tenant_guard):
     """
-    Run application lifespan (Claude health check, household registration, etc.)
+    Run application lifespan (household registration, backend globals)
     once per test session. ASGITransport doesn't trigger lifespan events,
     so we call it explicitly.
 
+    The backend health probes are stubbed (T-7): `make test` promises
+    "no external services", but the real probes coupled every unit run
+    to live infrastructure — an HTTP round trip to whatever answers
+    behind OLLAMA_HOST, and a real Anthropic API call whenever the dev
+    .env carries a key. The suite flaked whenever the local backend was
+    mid-deploy: the ollama probe failed, the cached globals flipped,
+    and any test that consults them unpatched changed behavior. The
+    stubs land the globals in the deterministic local-first state a
+    healthy startup produces; tests needing other states patch the
+    globals themselves, and `make test-integration` runs real probes.
+
     Depends on _tenant_guard so the suite refuses to start under the
     production tenant before any initialization happens.
     """
-    from src.core.startup import initialize_application
+    from unittest.mock import patch
 
-    asyncio.run(initialize_application())
+    from src.anthropic import model_selector
+    from src.core import startup
+
+    async def _healthy_local_backend() -> bool:
+        model_selector._ollama_available = True
+        model_selector._local_flavor = "boilerroom"
+        return True
+
+    async def _no_cloud_fallback() -> bool:
+        model_selector._claude_available = False
+        return False
+
+    # Patch the names startup actually calls (imported into its module).
+    with (
+        patch.object(startup, "check_ollama_health", _healthy_local_backend),
+        patch.object(startup, "check_claude_health", _no_cloud_fallback),
+    ):
+        asyncio.run(startup.initialize_application())
 
 
 @pytest.fixture

tests/core/test_session_init.py

@@ -0,0 +1,19 @@
+"""
+The suite's backend globals are stubbed, not probed (T-7).
+
+`make test` promises "no external services". The session init used to
+run the real health probes — an HTTP round trip to whatever answers
+behind OLLAMA_HOST and a real Anthropic API call whenever the dev .env
+carries a key — so the cached globals depended on live infrastructure,
+and the suite flaked whenever the backend was mid-deploy. This test
+discriminates: under the stub the globals are always the local-first
+healthy state; under real probes they follow the network of the moment.
+"""
+
+from src.anthropic import model_selector
+
+
+def test_session_globals_are_deterministic():
+    assert model_selector._ollama_available is True
+    assert model_selector._local_flavor == "boilerroom"
+    assert model_selector._claude_available is False