feat(KB-648): enable parallel test execution and optimize test performance

- Optimize backup tests using fake timers instead of real timeouts

- Enable parallel file execution in core, engine, CLI, and dashboard packages

- Add inline test helpers to reduce dependencies in dashboard routes tests

- Update executor tests with exact command matching and improved assertions

- Update AGENTS.md with test optimization patterns (fake timers, unique temp dirs)

packages/engine/src/logger.ts

@@ -64,15 +64,3 @@ export const reviewerLog = createLogger("reviewer");
 
 /** Logger for the PR monitor subsystem. */
 export const prMonitorLog = createLogger("pr-monitor");
-
-/** Logger for the project runtime subsystem. */
-export const runtimeLog = createLogger("runtime");
-
-/** Logger for the IPC subsystem. */
-export const ipcLog = createLogger("ipc");
-
-/** Logger for the project manager subsystem. */
-export const projectManagerLog = createLogger("project-manager");
-
-/** Logger for the hybrid executor subsystem. */
-export const hybridExecutorLog = createLogger("hybrid-executor");