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/cli/src/__tests__/thread-show-status.test.ts

@@ -305,8 +305,8 @@ describe("thread show status field", () => {
     await setupTestEnv();
     const casDir = join(tmpDir, "cas");
     await mkdir(casDir, { recursive: true });
-    const originalCasDir = process.env.UNCAGED_CAS_DIR;
-    process.env.UNCAGED_CAS_DIR = casDir;
+    const originalCasDir = process.env.OCAS_DIR;
+    process.env.OCAS_DIR = casDir;
 
     try {
       const workflowPath = join(tmpDir, "test-suspend-status.yaml");
@@ -331,9 +331,9 @@ describe("thread show status field", () => {
       expect(result.thread).toBe(threadId);
     } finally {
       if (originalCasDir === undefined) {
-        delete process.env.UNCAGED_CAS_DIR;
+        delete process.env.OCAS_DIR;
       } else {
-        process.env.UNCAGED_CAS_DIR = originalCasDir;
+        process.env.OCAS_DIR = originalCasDir;
       }
       await teardown();
     }