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/agent-vfc/openniw-jobs-b74de3/fixed.py

@@ -0,0 +1,28 @@
+# Provenance: ziyuzuo/openniw  (fixed).
+# repo: ziyuzuo/openniw
+# commit: b74de31b0a5f37e4e929ba6aa74dbe0f5e6d9a68
+# parent: 98a0c392ba96cd2c4aa746dd6fc2b183f385225e
+# commit_url: https://github.com/ziyuzuo/openniw/commit/b74de31b0a5f37e4e929ba6aa74dbe0f5e6d9a68
+# cve: 
+# license: MIT
+# function: get_job
+# relpath: backend/app/routers/jobs.py
+# provenance: agent
+# mechanism: identity_from_request_body
+
+async def get_job(job_id: str, user: dict = Depends(auth.current_user)) -> dict:
+    job = await jobs_service.get(job_id)
+    if job is None:
+        raise HTTPException(404, "Job not found")
+    # Authorization: case-bound jobs are visible only to the case owner;
+    # caseless jobs (free evaluations) are served by the public route only.
+    if job.get("case_id") is None:
+        raise HTTPException(404, "Job not found")
+    await auth.case_owned_by(str(job["case_id"]), user)
+    return {
+        "id": str(job["id"]),
+        "kind": job["kind"],
+        "status": job["status"],
+        "result": job["result"],
+        "error": job["error"],
+    }