feat(security): apply audited PR #6738 remediations and test hardening

- Enforce vision probe SSRF safe local host validation, SafeProbeBackend TOCTOU elimination, and session owner authorization
- Authorize session titling endpoints against registered owner configuration
- Sanitize sensitive metadata logging from agent loop debug logs
- Add async non-blocking execution for spec router tools and thinking decisions
- Harden email cache invalidation fencing and thread-safe mutation
- Add regression test suites for legacy browser authority, spec contracts, spec router request scoping, and task MCP delivery

tests/test_jeff_decision.py

@@ -37,6 +37,13 @@ def test_score_value_and_choice_of():
     assert jd.choice_of(None) is None
 
 
+def test_non_finite_score_falls_back(monkeypatch):
+    for bad in (float("nan"), float("inf"), "nan"):
+        assert jd.score_value({"type": "score", "score": bad}) is None
+        _enable(monkeypatch, bad)
+        assert _run(ba._spec_triage_email_urgency({"subject": "x", "body": "y"}, triage_version=11)) is None
+
+
 def test_disabled_job_does_not_call_adapter(monkeypatch):
     monkeypatch.setenv("ODYSSEUS_JEFF_EMAIL_URGENCY", "0")
     calls = {"n": 0}