umputun / ralphex / 21918265588

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fix: improve Ctrl+C (SIGINT) handling for immediate response

- Make ClaudeExecutor.parseStream context-aware with ctx.Done() check
  on each scan iteration (matching codex/custom executor pattern)
- Replace all time.Sleep calls in runner loops with sleepWithContext
  that uses select on timer and ctx.Done() for immediate cancellation
- Add startInterruptWatcher goroutine for instant "interrupting..."
  feedback on Ctrl+C, with cleanup to prevent goroutine leaks
- Add regression test verifying prompt exit on context cancellation
  during iteration delay

32 of 47 new or added lines in 3 files covered. (68.09%)

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