Implement ACTIVITY-WP-0021 production automation reliability

Root-cause IssueSink 503 (dead Forgejo PAT on issue-core), add state-hub
task sink path B, log runs before emit, harden sync_schedules, deterministic
SBOM/triage reports, DB probe thrash fix, and prod automation-status helper.

tests/test_issue_sink.py

@@ -11,11 +11,18 @@ from activity_core.rules.models import TaskRef, TaskSpec
 
 
 class DummyResponse:
-    def __init__(self, payload: dict[str, Any]) -> None:
+    def __init__(self, payload: dict[str, Any], status_code: int = 200) -> None:
         self.payload = payload
+        self.status_code = status_code
+        self.text = ""
 
     def raise_for_status(self) -> None:
-        return None
+        if self.status_code >= 400:
+            raise httpx.HTTPStatusError(
+                "error",
+                request=httpx.Request("POST", "http://issue-core.test/issues/"),
+                response=httpx.Response(self.status_code),
+            )
 
     def json(self) -> dict[str, Any]:
         return self.payload