test: add pending adversarial corpus manifest receipt

Author: LalaSkye

tests/adversarial/latest_adversarial_corpus_manifest.json

@@ -0,0 +1,18 @@
+{
+  "schema_version": "0.1",
+  "generator": "scripts/generate_adversarial_corpus_manifest.py",
+  "generated_at": "PENDING — run scripts/generate_adversarial_corpus_manifest.py to populate",
+  "fixture_dir": "tests/fixtures/adversarial_surface_gate",
+  "fixture_count": 0,
+  "corpus_hash": "PENDING",
+  "required_coverage": [],
+  "missing_coverage": [],
+  "fixtures": [],
+  "claim_boundary": {
+    "does_not_prove_universal_adversarial_coverage": true,
+    "does_not_prove_prompt_injection_immunity": true,
+    "does_not_prove_semantic_completeness": true,
+    "does_not_prove_production_readiness": true,
+    "allowed_claim": "The declared adversarial fixture corpus is stable, replayable, hashed, and represented by a canonical manifest."
+  }
+}