Add met_count and recall_limited_obligations to shadow telemetry

Reichert die Obligation-Shadow-Telemetrie um zwei Felder an für die Cross-Firmen-
Auswertung: met_count (abgedeckte Obligations) + recall_limited_obligations (welche
Obligations recall-limitiert sind) — erlaubt die Konzentrations-Analyse über Firmen.

7-Firmen-Shadow: 136 Control-Findings → 29 Obligation-Findings (4,7×); recall_limited
nur 6/29, konzentriert auf third_country/safeguards in 2/7 Firmen → LLM-Fix bounded.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend-compliance/tests/test_obligation_shadow.py

@@ -21,6 +21,7 @@ class TestComputeShadow:
         assert s["recall_limited"] == 0
         assert s["collapse_factor"] == 5.0
         assert s["met_failed_delta"] == 4
+        assert s["met_count"] == 0
         top = s["top_collapsed_obligations"][0]
         assert top["obligation"] == NON_LLM and top["fehlt"] == 5
         assert top["recall_limited"] is False
@@ -60,6 +61,7 @@ class TestRecallSegregation:
         assert s["obligation_findings"] == 1
         assert s["recall_limited"] == 1
         assert s["failed_by_current_checker"] == 0
+        assert s["recall_limited_obligations"] == [LLM_REQ]
         assert s["top_collapsed_obligations"][0]["recall_limited"] is True
 
     def test_mixed_real_gap_and_recall_limited(self):