Fixes#525: gt up reports deacon success but session doesn't actually start
Previously, WaitForCommand failures were marked as "non-fatal" in the
manager Start() methods used by gt up. This caused gt up to report
success even when Claude failed to start, because the error was silently
ignored.
Now when WaitForCommand or WaitForRuntimeReady times out:
1. The zombie tmux session is killed
2. An error is returned to the caller
3. gt up properly reports the failure
This aligns the manager Start() behavior with the cmd start functions
(e.g., gt deacon start) which already had fatal WaitForCommand behavior.
Changed files:
- internal/deacon/manager.go
- internal/mayor/manager.go
- internal/witness/manager.go
- internal/refinery/manager.go
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>
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