fix: fix 7 failing tests (OCAS_DIR → OCAS_HOME + restore workflow destructure)

Root cause: tests used OCAS_DIR env var but store.ts reads OCAS_HOME,
causing tests to hit the global ~/.ocas vars instead of temp dirs.

- store-unified-threads.test.ts: OCAS_DIR → OCAS_HOME (3 tests)
- thread-resume.test.ts: OCAS_DIR → OCAS_HOME (3 tests)
- current-role.test.ts: restore { thread, workflow } destructure
  that was incorrectly removed by biome unsafe fix (1 test)

Result: 745 passed, 0 failed, 1 skipped

Closes #49

.gitea/workflows/ci.yml

@@ -12,17 +12,15 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
-      - uses: actions/setup-node@v4
-        with:
-          node-version: 22
+      - uses: oven-sh/setup-bun@v2
 
-      - run: corepack enable && pnpm install
+      - run: bun install
 
       - name: Build
-        run: pnpm run build
+        run: bun run build
 
       - name: Lint
-        run: pnpm run check
+        run: bun run check
 
       - name: Test
-        run: pnpm run test:ci
+        run: bun run test:ci

pnpm-workspace.yaml

@@ -1,8 +1,2 @@
 packages:
   - 'packages/*'
-
-allowBuilds:
-  esbuild: true
-  msw: true
-
-minimumReleaseAge: 0