V32 Gate 6: Prove interface contract regressions

Add source-safe interface contract regression fixtures and proof generation for Terminal, API, MCP, ChatGPT App, Auxillaries, and deferred Exchange/Conversations hooks.

Wire Gate 6 checker, focused tests, V32 proof matrix, gate-quality CI, roadmap, and specification family so shared auth, policy denial, source-safety, and nondisclosure assertions are validated.

Author: geraldarthurdavis

.bitcode/v32-deterministic-replay-report.json

@@ -11,9 +11,9 @@
     {
       "artifactPath": ".bitcode/v32-proof-coverage-matrix.json",
       "byteEqual": true,
-      "byteLength": 20523,
-      "firstDigest": "sha256:79790aba3003cbebd2067de68ce2968918de76b398bfaa8872533899c9573049",
-      "secondDigest": "sha256:79790aba3003cbebd2067de68ce2968918de76b398bfaa8872533899c9573049"
+      "byteLength": 21157,
+      "firstDigest": "sha256:2021ab0d617d08e507ac902daacde19f70516f9d2f968bd946566891f72268d6",
+      "secondDigest": "sha256:2021ab0d617d08e507ac902daacde19f70516f9d2f968bd946566891f72268d6"
     }
   ],
   "artifactId": "v32-deterministic-replay-report",