feat(ql3): establish 3.0 incubation baseline

back/runtime/domain/executorErrors.ts

@@ -0,0 +1,50 @@
+export class ExecutorError extends Error {
+  constructor(
+    message: string,
+    public readonly code: string,
+    public readonly cause?: unknown,
+  ) {
+    super(message);
+    this.name = new.target.name;
+  }
+}
+
+export class InvalidExecutionSpecError extends ExecutorError {
+  constructor(message: string) {
+    super(message, 'INVALID_EXECUTION_SPEC');
+  }
+}
+
+export class ExecutorCapabilityUnavailableError extends ExecutorError {
+  constructor(public readonly capability: string) {
+    super(
+      `Required executor capability is unavailable: ${capability}`,
+      'EXECUTOR_CAPABILITY_UNAVAILABLE',
+    );
+  }
+}
+
+export class ExecutorStartError extends ExecutorError {
+  constructor(cause?: unknown) {
+    super(
+      'Executor failed to start the process',
+      'EXECUTOR_START_FAILED',
+      cause,
+    );
+  }
+}
+
+export class ExecutorHandleNotFoundError extends ExecutorError {
+  constructor(public readonly handleId: string) {
+    super(
+      'Execution handle is not owned by this executor instance',
+      'EXECUTOR_HANDLE_NOT_FOUND',
+    );
+  }
+}
+
+export class ExecutorStopError extends ExecutorError {
+  constructor(cause?: unknown) {
+    super('Executor failed to stop the process', 'EXECUTOR_STOP_FAILED', cause);
+  }
+}