Agent Mode: Add execution control (pause/resume/abort)

[CarGDev]

Problem

No visible mechanism to pause, resume, or abort agent execution mid-flow. Once execution starts, user loses control.

Expected Features

Pause/Resume

• Keyboard shortcut (e.g., Ctrl+P) to pause execution
• Show current state when paused
• Resume from exact point

Step-by-Step Mode

• Execute one tool call at a time
• Wait for user confirmation between steps
• Show what will happen next

Abort with Rollback

• Ctrl+C should cleanly abort
• Option to rollback changes made in current session
• Show summary of what was changed before abort

Implementation Suggestions

interface ExecutionControl {
  pause(): void;
  resume(): void;
  abort(rollback?: boolean): void;
  stepMode(enabled: boolean): void;
  getState(): 'running' | 'paused' | 'aborted' | 'completed';
}

Priority

🟡 Medium - Important for user confidence but not blocking

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Generated from model evaluation test

[CarGDev]

Implemented in commit 8b8f9f4. Added execution control with:

• Ctrl+P: Toggle pause/resume
• Ctrl+Z: Abort with rollback (undo file changes)
• Ctrl+Shift+S: Toggle step-by-step mode
• Enter: Advance one step when waiting

Rollback tracks file writes/edits and can restore original content on abort.