refactor: consolidate skill docs, add anti-drift tests, and apply audit fixes

DLO-13: Restructure vlm-library-workflow skill as safety contract layer.
- Rewrite SKILL.md (69 lines): safety contract, execution threshold semantics,
  six-step high-risk loop, decision rules, phase skeleton
- Delete redundant references (cli-reference, workflow, command-recipes, dev-guide)
- Add triage.md (failure mapping + preflight) and dev-map.md (module→test mapping)
- Add tests/test_docs_consistency.py: 78 parametrized tests verifying documented
  vlm commands exist in CLI registry
- Add CSV path mismatch test to test_plan_review.py (4th safety gate path)
- Delete vlm-expert.skill (Gemini package, 7 months stale) and README Gemini section

DLO-2 audit fixes: rate limiter injection, symmetric quarantine categories,
review-plan safety gates, parser improvements, planner validation.

CLI modularization: commands/ directory with one module per command group.

src/vlm/plan_review.py

@@ -35,6 +35,7 @@ REVIEW_CSV_ENRICHED_FIELDS = [
     "rel_dest",
     "quality_hint",
     "duplicate_group_id",
+    "sidecars",
 ]
 
 REVIEW_CSV_ALL_FIELDS = REVIEW_CSV_BASE_FIELDS + REVIEW_CSV_ENRICHED_FIELDS
@@ -246,6 +247,11 @@ def enrich_review_row(
             enriched["episode"] = str(ctx["episode"])
         if ctx.get("duplicate_group_id"):
             enriched["duplicate_group_id"] = str(ctx["duplicate_group_id"])
+        sidecars = ctx.get("sidecars")
+        if isinstance(sidecars, list) and sidecars:
+            names = [str(item.get("name", "")) for item in sidecars if isinstance(item, dict)]
+            if names:
+                enriched["sidecars"] = ", ".join(names)
 
     if identity_lookup and source_path:
         id_ctx = identity_lookup.get(source_path) or identity_lookup.get(