refactor default artifacts workspace and path compatibility

CHANGELOG.md

@@ -2,6 +2,19 @@
 
 ## 2026-02-16
 
+### Artifact Path Governance
+
+- Changed default workflow artifact outputs from repository root to `artifacts/`:
+  - `artifacts/inventory.csv`
+  - `artifacts/identities.json`
+  - `artifacts/analysis.json`
+  - `artifacts/plan.json`
+  - `artifacts/plan_manual_review.csv`
+- Added `workspace_dir` to configuration (`~/.vlm/config.yaml`) to customize default artifact directory.
+- Stage-A compatibility: when a command uses default input path and only legacy root artifact exists, CLI now prints a migration warning and falls back to the legacy file.
+- Added ignore rules for generated artifact directories in `.gitignore` (`artifacts/`, `runs/`).
+- Removed temporary process document `ARTIFACTS_REFACTOR_PLAN_2026-02-16.md`; `CHANGELOG.md` remains the canonical change record.
+
 ### Refactor Results
 
 - Modularized CLI command implementations: