What Problem This Solves

In the CLI runtime environment, createNonExitingRuntime() simulates a process exit by throwing a generic new Error("exit ${code}"). This is a dangerous anti-pattern because upstream try-catch blocks designed to catch real runtime crashes will accidentally catch this control-flow signal, logging it as a bug rather than terminating the CLI command.

Expected vs Actual Behavior

Expected: The runtime should throw a specific subclass (e.g., class ExitError extends Error) so upstream callers can explicitly check if (err instanceof ExitError) and respect the simulated exit.
Actual: It throws a generic Error.

Code Link

https://github.com/openclaw/openclaw/blob/main/src/runtime.ts#L98-L105

Proposed Solution

Introduce a strongly-typed ExitError class in runtime.ts and update createNonExitingRuntime to throw it.