Freeze calibration-derived document and code relevance hypothesis

tools/relevance-eval/policies/cosine-v1.json

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+{
+  "version": 1,
+  "id": "document-code-cosine-070-v1",
+  "status": "frozen diagnostic hypothesis, not production policy",
+  "calibration_report_sha256": "56f42c523527dd748918bb8f17be6bd7818158227e692fccaf387d915f9d0a94",
+  "fixture_sha256": "000047fd17accd315b6138093bbdc9f353cd877b4bf1958fbe336e4a6b10cd2e",
+  "semantic_cosine_minimum": 0.7,
+  "comparison": "greater_than_or_equal",
+  "scope": ["all_files", "code"],
+  "modality": "document and code text only",
+  "lexical_results": "preserve unchanged, including exact identifier priority",
+  "semantic_results": "retain only raw semantic cosine scores at or above the minimum before hybrid fusion",
+  "limitations": "Not a probability or universal model cutoff. Small bilingual paired corpus; media excluded. Do not tune this version after held-out evaluation."
+}