fix(orchestrator): reap registry rows whose bottle is no longer running

A registry row only ever left the registry two ways: an explicit
teardown_bottle (the launcher's cleanup callback) or the same-IP supersede
sweep in register(). Neither runs when the launching CLI dies hard, so the
row outlives its container.

That orphan is not inert. Source IPs are recycled by the backend's DHCP and
by_source_ip fail-closes on ambiguity, so a leftover row at a reused address
resolves no policy at all for the next bottle that lands there — and a
bottle with no policy denies every host, which surfaces to the agent as
"host X is not in the allowlist" for hosts that were never the problem.

Add reap_absent/reconcile and call it from the macOS launch path before
registering, so each launch self-heals the registry. Restores the invariant
the data plane needs: at most one active row per live address, and none for
a dead one. The second half matters as much as the first — when several rows
claim a *live* address the newest wins and the rest are swept, otherwise a
recycled address stays ambiguous, which is exactly the bricked state.

The host supplies the live set because the orchestrator runs inside the
infra container and cannot see the backend. A grace window exempts rows
younger than it, so reconciliation cannot race a bottle still coming up, and
a reconcile failure is logged rather than blocking an otherwise-fine launch.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/unit/test_orchestrator_client.py

@@ -104,3 +104,32 @@ class TestHealthAndPolicy(unittest.TestCase):
 
 if __name__ == "__main__":
     unittest.main()
+
+
+class TestReconcile(unittest.TestCase):
+    def setUp(self) -> None:
+        self.c = OrchestratorClient("http://orch:8080")
+
+    def test_posts_live_ips_and_returns_reaped(self) -> None:
+        with patch(_URLOPEN, return_value=_resp(200, {"reaped": ["b1", "b2"]})) as m:
+            got = self.c.reconcile(["10.0.0.2", "10.0.0.3"])
+        self.assertEqual(["b1", "b2"], got)
+        sent = json.loads(m.call_args.args[0].data)
+        self.assertEqual(["10.0.0.2", "10.0.0.3"], sent["live_source_ips"])
+        self.assertNotIn("grace_seconds", sent)  # omitted -> server default
+
+    def test_grace_seconds_is_forwarded_when_given(self) -> None:
+        with patch(_URLOPEN, return_value=_resp(200, {"reaped": []})) as m:
+            self.c.reconcile([], grace_seconds=30)
+        self.assertEqual(30, json.loads(m.call_args.args[0].data)["grace_seconds"])
+
+    def test_malformed_reaped_is_tolerated(self) -> None:
+        with patch(_URLOPEN, return_value=_resp(200, {"reaped": ["ok", 5, None]})):
+            self.assertEqual(["ok"], self.c.reconcile([]))
+        with patch(_URLOPEN, return_value=_resp(200, {})):
+            self.assertEqual([], self.c.reconcile([]))
+
+    def test_error_status_raises(self) -> None:
+        with patch(_URLOPEN, side_effect=_http_error(500)):
+            with self.assertRaises(OrchestratorClientError):
+                self.c.reconcile([])