ci: split test execution to prevent mock.module pollution

.github/workflows/ci.yml

@@ -44,8 +44,34 @@ jobs:
         env:
           BUN_INSTALL_ALLOW_SCRIPTS: "@ast-grep/napi"
 
-      - name: Run tests
-        run: bun test --max-concurrency 1
+      - name: Run mock-heavy tests (isolated)
+        run: |
+          # These files use mock.module() which pollutes module cache
+          # Run them in separate processes to prevent cross-file contamination
+          bun test src/plugin-handlers
+          bun test src/hooks/atlas
+          bun test src/hooks/compaction-context-injector
+          bun test src/features/tmux-subagent
+
+      - name: Run remaining tests
+        run: |
+          # Run all other tests (mock-heavy ones are re-run but that's acceptable)
+          bun test bin script src/cli src/config src/mcp src/index.test.ts \
+            src/agents src/tools src/shared \
+            src/hooks/anthropic-context-window-limit-recovery \
+            src/hooks/claude-code-compatibility \
+            src/hooks/context-injection \
+            src/hooks/provider-toast \
+            src/hooks/session-notification \
+            src/hooks/sisyphus \
+            src/hooks/todo-continuation-enforcer \
+            src/features/background-agent \
+            src/features/builtin-commands \
+            src/features/builtin-skills \
+            src/features/claude-code-session-state \
+            src/features/hook-message-injector \
+            src/features/opencode-skill-loader \
+            src/features/skill-mcp-manager
 
   typecheck:
     runs-on: ubuntu-latest