feat(daemon): Reorganize and refactor core into client/daemon/shared modules; add IPC protocol and tests

ts/shared/protocol/error.codes.ts

@@ -0,0 +1,26 @@
+/**
+ * Standardized error codes for IPC communication
+ * These are used instead of string messages for better error handling
+ */
+export enum ErrorCode {
+  // General errors
+  UNKNOWN_ERROR = 'UNKNOWN_ERROR',
+  INVALID_REQUEST = 'INVALID_REQUEST',
+  
+  // Process errors
+  PROCESS_NOT_FOUND = 'PROCESS_NOT_FOUND',
+  PROCESS_ALREADY_EXISTS = 'PROCESS_ALREADY_EXISTS',
+  PROCESS_START_FAILED = 'PROCESS_START_FAILED',
+  PROCESS_STOP_FAILED = 'PROCESS_STOP_FAILED',
+  
+  // Daemon errors
+  DAEMON_NOT_RUNNING = 'DAEMON_NOT_RUNNING',
+  DAEMON_ALREADY_RUNNING = 'DAEMON_ALREADY_RUNNING',
+  
+  // Memory errors
+  MEMORY_LIMIT_EXCEEDED = 'MEMORY_LIMIT_EXCEEDED',
+  
+  // Config errors
+  CONFIG_INVALID = 'CONFIG_INVALID',
+  CONFIG_SAVE_FAILED = 'CONFIG_SAVE_FAILED',
+}