refactor: remove all uncaged codename references

- Remove UNCAGED_CAS_DIR and UNCAGED_WORKFLOW_STORAGE_ROOT env var fallbacks
- Tests updated to use OCAS_DIR / UWF_STORAGE_ROOT
- All docs, READMEs, scripts, workflows, skills updated
- Only symlink migration code retains .uncaged paths (functional requirement)

Closes #12 (Phase 5 complete)

packages/agent-claude-code/package.json

@@ -35,12 +35,12 @@
   },
   "repository": {
     "type": "git",
-    "url": "https://git.shazhou.work/uncaged/workflow.git",
+    "url": "https://git.shazhou.work/shazhou/united-workforce.git",
     "directory": "packages/agent-claude-code"
   },
-  "homepage": "https://git.shazhou.work/uncaged/workflow#readme",
+  "homepage": "https://git.shazhou.work/shazhou/united-workforce#readme",
   "bugs": {
-    "url": "https://git.shazhou.work/uncaged/workflow/issues"
+    "url": "https://git.shazhou.work/shazhou/united-workforce/issues"
   },
   "license": "MIT"
 }