Add reproducible release artifact proof

tests/test_release_identity.py

@@ -0,0 +1,30 @@
+from __future__ import annotations
+
+import unittest
+
+from tools.check_release_identity import build_release_identity_evidence
+
+
+class ReleaseIdentityTests(unittest.TestCase):
+    def test_smoke_identity_is_consistent_before_tagging(self) -> None:
+        evidence = build_release_identity_evidence(
+            mode="smoke",
+            require_clean=False,
+            tag_state="absent",
+        )
+
+        self.assertEqual(1, evidence["schema_version"])
+        self.assertEqual("1.4.0", evidence["version"])
+        self.assertEqual(
+            {
+                "docforge.cli": "docforge 1.4.0",
+                "docforge.mcp_server": "docforge-mcp 1.4.0",
+                "docforge.reference_mcp": "python -m docforge.reference_mcp 1.4.0",
+                "docforge.viewer_manager": "docforge-viewer-manager 1.4.0",
+            },
+            evidence["surfaces"],
+        )
+
+
+if __name__ == "__main__":
+    unittest.main()