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.

CHANGELOG.md

@@ -13,6 +13,12 @@
 
 ## 2026-05-21
 
+### CLI line-count reduction (phase 2)
+
+- Shrunk `cli.py` to a thin registrar (~70 lines); Click definitions live beside command implementations in `commands/`.
+- Deduplicated report commands via `reports.duplicate_groups_from_analysis` / `completeness_from_analysis` and shared `cli_helpers.run_command` / `emit_report`.
+- Archived the completed simplification plan under `docs/archive/2026-pre-baseline/`.
+
 ### Functional code simplification
 
 - Removed unused `src/vlm/exceptions.py` and consolidated plan summary helpers (`preferred_plan_summary` everywhere).
@@ -22,6 +28,11 @@
 - Fixed series parser empty title when the only title token is a quality tag (e.g. `UHD S01E01.mp4`).
 - Verification: `pytest -q` → **517 passed**.
 
+### Documentation sync
+
+- Resynchronized `README.md`, `CLAUDE.md`, `AGENTS.md`, and `skills/vlm-library-workflow/` docs to the CLI-modularization baseline; refreshed validation baseline (`pytest -q` → **529 passed**).
+- Fixed the archive index pointer to the completed simplification plan (now inside `docs/archive/2026-pre-baseline/`).
+
 ## 2026-04-07
 
 ### Review-plan Safety & Validation Hardening