- Add STAGE_COMPLETE_TOOL constant and meta-tool handler in executeStage
loop: when LLM calls stage_complete, break out of tool dispatch loop
and proceed to normal validation/transition
- Inject stage_complete tool definition in every inference request so
the LLM always has the option to signal stage completion
- Replace expand-all diff with scrollable diff window in approval
surface (ctrl+x toggles, up/down scrolls, shows line range)
kami
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