feat(reviewer): require trust-gate proof in empty-queue reports (#198)

Add assess_empty_queue_report to block empty-queue claims without
pr_inventory_trust_gate.status == trusted_empty, reject weak merge-commit
corroboration, extend inventory handoff fields, and wire the gate into
build_final_report and capability-stop terminal validation.

Co-Authored-By: Claude Opus 4.8 (1M context) <[email protected]>

capability_stop_terminal.py

@@ -120,6 +120,11 @@ def assess_capability_stop_report(
     capability_denied: bool = True,
 ) -> dict:
     """Validate final report purity after reviewer capability denial."""
+    from review_proofs import (
+        assess_empty_queue_report,
+        parse_trust_gate_status_from_report,
+    )
+
     text = report_text or ""
     lower = text.lower()
     violations = []
@@ -148,13 +153,19 @@ def assess_capability_stop_report(
         r"inventory empty",
         re.I,
     )
+    parsed_status = parse_trust_gate_status_from_report(text)
+    effective_status = trust_gate_status or parsed_status
     if empty_queue_patterns.search(text):
-        if trust_gate_status != "trusted_empty":
+        if effective_status != "trusted_empty":
             violations.append(
                 "empty-queue claim after capability stop without "
                 "pr_inventory_trust_gate.status == trusted_empty"
             )
 
+    empty_queue = assess_empty_queue_report(text)
+    if empty_queue.get("claimed") and not empty_queue.get("proven"):
+        violations.extend(empty_queue.get("reasons") or [])
+
     ok, elig_violations = validate_eligibility_wording(text)
     violations.extend(elig_violations)