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/dnf-plugin-anyrepo-config-26d19a/fixed.py

@@ -0,0 +1,26 @@
+# Provenance: jfut/dnf-plugin-anyrepo  (fixed).
+# repo: jfut/dnf-plugin-anyrepo
+# commit: 26d19aeb8884f244e34ccfdc4f49f07055adc4d0
+# parent: 33cde479d0db8f45dd89fbdcfb2bc0f1be66bd7a
+# commit_url: https://github.com/jfut/dnf-plugin-anyrepo/commit/26d19aeb8884f244e34ccfdc4f49f07055adc4d0
+# cve: 
+# license: Apache-2.0
+# function: validate_repo_name
+# relpath: dnf_plugin_anyrepo/config.py
+# provenance: agent
+# mechanism: path_join_user_input
+
+def validate_repo_name(name: str) -> str:
+    """Validate the INI section name used as the repository alias."""
+
+    normalized = str(name).strip()
+    if not normalized:
+        raise ConfigError("repository name must not be empty")
+    if normalized == "main":
+        raise ConfigError("repository name must not be main")
+    # Keep the alias from resolving to the cache directory itself or its parent.
+    if normalized in {".", ".."}:
+        raise ConfigError(f"invalid repository name: {name}")
+    if any(char in normalized for char in "\x00\r\n[]/\\"):
+        raise ConfigError(f"invalid repository name: {name}")
+    return normalized

benchmarks/pairs/agent-vfc/dnf-plugin-anyrepo-config-26d19a/vuln.py

@@ -0,0 +1,23 @@
+# Provenance: jfut/dnf-plugin-anyrepo  (vuln).
+# repo: jfut/dnf-plugin-anyrepo
+# commit: 33cde479d0db8f45dd89fbdcfb2bc0f1be66bd7a
+# parent: 33cde479d0db8f45dd89fbdcfb2bc0f1be66bd7a
+# commit_url: https://github.com/jfut/dnf-plugin-anyrepo/commit/26d19aeb8884f244e34ccfdc4f49f07055adc4d0
+# cve: 
+# license: Apache-2.0
+# function: validate_repo_name
+# relpath: dnf_plugin_anyrepo/config.py
+# provenance: agent
+# mechanism: path_join_user_input
+
+def validate_repo_name(name: str) -> str:
+    """Validate the INI section name used as the repository alias."""
+
+    normalized = str(name).strip()
+    if not normalized:
+        raise ConfigError("repository name must not be empty")
+    if normalized == "main":
+        raise ConfigError("repository name must not be main")
+    if any(char in normalized for char in "\r\n[]"):
+        raise ConfigError(f"invalid repository name: {name}")
+    return normalized