test(ci): isolate CCS-managed env vars from host session

When tests run inside a CCS-managed Claude session, host env vars
(CLAUDE_CONFIG_DIR, CCS_PROFILE_TYPE) leak into subprocess spawns
and fixture setup, causing 9 test failures:

- persist-command-handler: reads real symlinked settings.json instead
  of temp fixture because CLAUDE_CONFIG_DIR overrides scoped CCS_HOME
- websearch-transformer: hook silently exits via shouldSkipHook()
  because CCS_PROFILE_TYPE=account triggers native_account_profile skip
- claudecode-env-stripping: normalizeSharedPluginMetadataPaths receives
  leaked CLAUDE_CONFIG_DIR instead of undefined for default profiles

Fix: clear CCS-managed env vars in beforeEach and neutralize
CCS_PROFILE_TYPE in subprocess env blocks.

Built [OnSteroids](https://onsteroids.ai)

tests/unit/commands/persist-command-handler.test.ts

@@ -73,6 +73,7 @@ function stubProcessExit(): void {
 beforeEach(async () => {
   tempRoot = await fs.promises.mkdtemp(path.join(os.tmpdir(), 'ccs-persist-handler-test-'));
   originalClaudeConfigDir = process.env.CLAUDE_CONFIG_DIR;
+  delete process.env.CLAUDE_CONFIG_DIR;
   originalProcessExit = process.exit;
   originalFsOpen = fs.promises.open;
   originalFsRename = fs.promises.rename;

tests/unit/hooks/websearch-transformer.test.ts

@@ -101,6 +101,7 @@ function runHookWithMockedFetch(mode: 'success' | 'empty' | 'non-result' | 'fail
       }),
       env: {
         ...process.env,
+        CCS_PROFILE_TYPE: '',
         CCS_WEBSEARCH_ENABLED: '1',
         CCS_WEBSEARCH_SKIP: '0',
         CCS_WEBSEARCH_BRAVE: '0',
@@ -352,6 +353,7 @@ describe('websearch-transformer hook helpers', () => {
         }),
         env: {
           ...process.env,
+          CCS_PROFILE_TYPE: '',
           CCS_HOME: ccsHome,
           CCS_WEBSEARCH_TRACE: '1',
           CCS_WEBSEARCH_TRACE_LAUNCH_ID: 'hook-trace-test',
@@ -428,6 +430,7 @@ describe('websearch-transformer hook helpers', () => {
         }),
         env: {
           ...process.env,
+          CCS_PROFILE_TYPE: '',
           CCS_HOME: ccsHome,
           CCS_WEBSEARCH_TRACE: '1',
           CCS_WEBSEARCH_TRACE_FILE: disallowedTracePath,
@@ -509,6 +512,7 @@ global.fetch = async (url) => {
         }),
         env: {
           ...process.env,
+          CCS_PROFILE_TYPE: '',
           CCS_HOME: ccsHome,
           CCS_WEBSEARCH_TRACE: '1',
           CCS_WEBSEARCH_TRACE_LAUNCH_ID: 'quota-fallback-test',
@@ -623,6 +627,7 @@ global.fetch = async (url) => {
         }),
         env: {
           ...process.env,
+          CCS_PROFILE_TYPE: '',
           CCS_HOME: ccsHome,
           CCS_WEBSEARCH_TRACE: '1',
           CCS_WEBSEARCH_TRACE_LAUNCH_ID: 'cooldown-skip-test',
@@ -723,6 +728,7 @@ global.fetch = async (url) => {
         }),
         env: {
           ...process.env,
+          CCS_PROFILE_TYPE: '',
           CCS_HOME: ccsHome,
           CCS_WEBSEARCH_TRACE: '1',
           CCS_WEBSEARCH_TRACE_LAUNCH_ID: 'transient-retry-test',

tests/unit/utils/claudecode-env-stripping.test.ts

@@ -30,6 +30,7 @@ let baselineSighupListeners: Array<(...args: unknown[]) => void> = [];
 let originalCcsHome: string | undefined;
 let originalCcsClaudePath: string | undefined;
 let originalDisableAutoUpdater: string | undefined;
+let originalClaudeConfigDir: string | undefined;
 const realSpawn = childProcess.spawn.bind(childProcess);
 const realSpawnSync = childProcess.spawnSync.bind(childProcess);
 const realExecSync = childProcess.execSync.bind(childProcess);
@@ -154,7 +155,9 @@ describe('CLAUDECODE environment stripping', () => {
     originalCcsHome = process.env.CCS_HOME;
     originalCcsClaudePath = process.env.CCS_CLAUDE_PATH;
     originalDisableAutoUpdater = process.env.DISABLE_AUTOUPDATER;
+    originalClaudeConfigDir = process.env.CLAUDE_CONFIG_DIR;
     delete process.env.DISABLE_AUTOUPDATER;
+    delete process.env.CLAUDE_CONFIG_DIR;
     baselineSigintListeners = process.listeners('SIGINT');
     baselineSigtermListeners = process.listeners('SIGTERM');
     baselineSighupListeners = process.listeners('SIGHUP');
@@ -175,6 +178,8 @@ describe('CLAUDECODE environment stripping', () => {
     } else {
       delete process.env.DISABLE_AUTOUPDATER;
     }
+    if (originalClaudeConfigDir !== undefined) process.env.CLAUDE_CONFIG_DIR = originalClaudeConfigDir;
+    else delete process.env.CLAUDE_CONFIG_DIR;
 
     for (const listener of process.listeners('SIGINT')) {
       if (!baselineSigintListeners.includes(listener)) {