Introduce key state machine for vim/readline parity #3964
+767
−6
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\n## Summary\n- add a reusable key-state machine to model leader and chord navigation patterns\n- hook the TUI app and session view into the new engine so list/select inputs mirror readline + vim behavior\n- adjust CLI UI plumbing to surface the richer navigation metadata\n\n## Testing\n- not run (branch inherits existing typecheck failures)\n