fix(test): scope child_process mock to test lifecycle

- register child_process module mock in beforeAll instead of module load

- keep passthrough for non-Claude commands and restore after suite

- avoids cross-suite side effects that stalled cursor daemon CI tests

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

@@ -53,6 +53,7 @@ function shouldMockCommand(command: string): boolean {
   return normalized.includes('claude');
 }
 
+function registerChildProcessMock(): void {
   mock.module('child_process', () => ({
     ...childProcess,
     spawn: (...spawnArgs: unknown[]) => {
@@ -97,12 +98,15 @@ mock.module('child_process', () => ({
         execArgs[1] as Parameters<typeof childProcess.execSync>[1]
       ),
   }));
+}
 
 let execClaude: typeof import('../../../src/utils/shell-executor').execClaude;
 let stripClaudeCodeEnv: typeof import('../../../src/utils/shell-executor').stripClaudeCodeEnv;
 let HeadlessExecutor: typeof import('../../../src/delegation/headless-executor').HeadlessExecutor;
 
 beforeAll(async () => {
+  registerChildProcessMock();
+
   const shellExecutor = await import('../../../src/utils/shell-executor');
   execClaude = shellExecutor.execClaude;
   stripClaudeCodeEnv = shellExecutor.stripClaudeCodeEnv;