docs: record first research contract sync

references/cross_project_contract/fixture_manifest.v1.json

@@ -4,8 +4,23 @@
   "fixtures": [
     {
       "id": "public_synthetic_delhi_1990_noon_mean_lahiri",
-      "birth": {"synthetic": true, "year": 1990, "month": 1, "day": 1, "hour": 12, "minute": 0, "second": 0, "lat": 28.6139, "lon": 77.209, "tz": 5.5},
-      "effective": {"ayanamsa": "lahiri", "node_mode": "mean", "timezone_offset": 5.5},
+      "birth": {
+        "synthetic": true,
+        "year": 1990,
+        "month": 1,
+        "day": 1,
+        "hour": 12,
+        "minute": 0,
+        "second": 0,
+        "lat": 28.6139,
+        "lon": 77.209,
+        "tz": 5.5
+      },
+      "effective": {
+        "ayanamsa": "lahiri",
+        "node_mode": "mean",
+        "timezone_offset": 5.5
+      },
       "compatibility_hash": "257042461fe303aa3bff5a8333f65090832ce8a2be395f038523838d724b474b"
     }
   ]

references/cross_project_contract/sync_ledger.json

@@ -1,4 +1,27 @@
 {
   "schema_version": 1,
-  "entries": []
+  "entries": [
+    {
+      "source_repository": "732642856/yinduzhanxing",
+      "source_commit": "f4d8148fc031cfa581bce7f30410fcd63fc89202",
+      "target_repository": "jesse-ux/Jyotisha",
+      "target_commit": "fd06bdc2eefa5547ed09968a218a8590df484bf3",
+      "change_class": "calculation_contract",
+      "copied_files": [
+        "references/cross_project_contract/fixture_manifest.v1.json",
+        "references/cross_project_contract/sync_ledger.json",
+        "scripts/cross_project_contract.py",
+        "tests/test_cross_project_contract.py"
+      ],
+      "dependency_delta": "none",
+      "privacy_review": "pass: public synthetic fixture only; no production configuration or user data",
+      "focused_tests": [
+        "python3 -m pytest -q tests/test_cross_project_contract.py",
+        "python3 scripts/cross_project_contract.py --require-match --format json",
+        "python3 scripts/public_release_privacy_scan.py --json"
+      ],
+      "hash_contract_result": "pass: 257042461fe303aa3bff5a8333f65090832ce8a2be395f038523838d724b474b",
+      "rollback": "git revert f4d8148 / git revert fd06bdc"
+    }
+  ]
 }