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/waggledance-swarm-ssrf-host-guard-9a4548/vuln.py

@@ -0,0 +1,25 @@
+# Provenance: Ahkeratmehilaiset/waggledance-swarm  (vuln).
+# repo: Ahkeratmehilaiset/waggledance-swarm
+# commit: 934b939f1cca5259eaf807db3319eb97b90d8d80
+# parent: 934b939f1cca5259eaf807db3319eb97b90d8d80
+# commit_url: https://github.com/Ahkeratmehilaiset/waggledance-swarm/commit/9a454843aa35332ff2eb3106023eee0c4b5e444b
+# cve: 
+# license: Apache-2.0
+# function: normalize_allowed_hosts
+# relpath: waggledance/core/v3_13_0/ssrf_host_guard.py
+# provenance: agent
+# mechanism: source_reaches_sink
+
+def normalize_allowed_hosts(raw_hosts: Sequence[str]) -> frozenset[str]:
+    """Validate and canonicalize an exact-host allowlist."""
+    if not isinstance(raw_hosts, Sequence) or isinstance(raw_hosts, (str, bytes)):
+        raise ValueError("ALLOWLIST_HOSTS_REFUSED")
+    normalized: set[str] = set()
+    for index, host in enumerate(raw_hosts):
+        if not isinstance(host, str) or not host.strip():
+            raise ValueError(f"ALLOWLIST_HOSTS_REFUSED_{index}")
+        clean = normalize_host(host)
+        if "://" in clean or "/" in clean or "?" in clean or "@" in clean:
+            raise ValueError(f"ALLOWLIST_HOSTS_REFUSED_{index}")
+        normalized.add(clean)
+    return frozenset(normalized)