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

packages/cli/src/__tests__/current-role.test.ts

@@ -324,7 +324,7 @@ describe("currentRole field", () => {
     try {
       const wf = join(tmpDir, "test-current-role.yaml");
       await writeFile(wf, SIMPLE_WORKFLOW_YAML, "utf8");
-      const { thread } = await cmdThreadStart(storageRoot, wf, "test", tmpDir);
+      const { thread, workflow } = await cmdThreadStart(storageRoot, wf, "test", tmpDir);
       const tid = thread as ThreadId;
 
       await createMarker(storageRoot, {

packages/cli/src/__tests__/store-unified-threads.test.ts

@@ -15,7 +15,7 @@ import {
 async function makeUwfStore(storageRoot: string) {
   const casDir = join(storageRoot, "cas");
   await mkdir(casDir, { recursive: true });
-  process.env.OCAS_DIR = casDir;
+  process.env.OCAS_HOME = casDir;
   return createUwfStore(storageRoot);
 }
 

packages/cli/src/__tests__/thread-resume.test.ts

@@ -491,7 +491,7 @@ describe("uwf thread resume - completed threads", () => {
       cwd: tmpDir,
     });
 
-    process.env.OCAS_DIR = casDir;
+    process.env.OCAS_HOME = casDir;
 
     const workerOutputHash = await store.cas.put(outputSchemaHash, { $status: "_" });
     const reviewerOutputHash = await store.cas.put(outputSchemaHash, { $status: "_" });
@@ -654,7 +654,7 @@ echo '${adapterJson}'
       cwd: tmpDir,
     });
 
-    process.env.OCAS_DIR = casDir;
+    process.env.OCAS_HOME = casDir;
     await seedThreads(tmpDir, {
       [THREAD_ID]: {
         head: startHash,
@@ -702,7 +702,7 @@ echo '${adapterJson}'
       cwd: tmpDir,
     });
 
-    process.env.OCAS_DIR = casDir;
+    process.env.OCAS_HOME = casDir;
     await seedThreads(tmpDir, { [THREAD_ID]: startHash });
 
     const result = runUwf(["thread", "resume", THREAD_ID], casDir);