feat(pair-corpus-honesty): add vibe-py, vfc-js and agent-vfc slices with mechanism vocabulary

Tasks 1.1, 5.1, 5.2, 5.4 and the data half of 5.3.

- mechanisms.toml: closed vocabulary v1 (20 ids) every expected row cites.
- vibe-py: 35 Real-Vuln-Benchmark pairs (Apache-2.0), human provenance only
  because the LLM-generated repositories carry no license (escalated).
- vfc-js: 17 Node fix-commit pairs harvested upstream (MIT/Apache-2.0),
  SecBench.js itself is not vendored (no license); sinks derived on 13/17.
- agent-vfc: 29 agent-trailer fixes as catalog-candidates.toml plus
  REVIEW.md; the loaded catalog stays empty until a human reviews them.
- datasets.toml and README document every slice and its review status.

Co-Authored-By: Claude Fable 5.1 <[email protected]>
Claude-Session: https://claude.ai/code/session_01T7XD7x5KonMdmGRkp63EQG

benchmarks/pairs/vibe-py/threatbyte-api-v1-get/vuln.py

@@ -0,0 +1,29 @@
+# Provenance: anotherik/ThreatByte get (vuln).
+# repo: anotherik/ThreatByte
+# commit: c4db46f72586c4ecb65859051ea037018dbf0e5e
+# parent: c4db46f72586c4ecb65859051ea037018dbf0e5e
+# commit_url: https://github.com/anotherik/ThreatByte/blob/c4db46f72586c4ecb65859051ea037018dbf0e5e/server/api/v1/api_v1.py#L154
+# cve: 
+# license: MIT
+# function: get
+# relpath: server/api/v1/api_v1.py
+# provenance: human
+# mechanism: missing_auth_guard
+
+    def get(self):
+        """
+        Retrieves the profile information of a user based on the provided user ID.
+        """
+        args = profile_query.parse_args()
+        user_id = args.get('user_id')
+
+        with get_db_connection() as conn:
+            cursor = conn.cursor()
+            query = "SELECT username, email, country, role, permissions, team FROM users WHERE id = ?"
+            cursor.execute(query, (user_id,))
+            user_profile = cursor.fetchone()
+
+        if user_profile:
+            return dict(user_profile), 200
+        else:
+            return {'error': 'User profile not found'}, 404