fix: waiting for approval when creating rules

[swrzalek]

Fix approval prompt not rendering when creating rules

Problem

When the agent requested approval for file-modifying tools (e.g., write_file to create .dexter/RULES.md), the CLI showed "Waiting for approval..." but never rendered the actual approval overlay with selectable options. Pressing Enter had no effect because the approval prompt was never displayed.

Root Cause

renderSelectionOverlay() was only called from the model selection callback and startup — never from the agent runner's onChange. When the agent entered approval state, the working indicator updated but the overlay wasn't triggered.

Fix

Added lastPendingApproval state tracking in the onChange callback (src/cli.ts). When pendingApproval transitions (enters or exits), renderSelectionOverlay() is now called to properly show/hide the approval overlay.

Tests

Added 12 unit tests in src/controllers/agent-runner.test.ts covering:

• Approval state transitions (enter/exit)
• onChange firing during approval state changes
• cancelExecution behavior
• Edge cases (no-op when no approval pending)

Files Changed

• src/cli.ts - Track pendingApproval changes and trigger overlay rendering
• src/controllers/agent-runner.test.ts - 12 new tests for approval state management

Resolves: #245

[swrzalek]

@virattt ready for review :)

[swrzalek]

we can also create test-utils. I am open.

[virattt]

Also fixes: #266

[virattt]

🚀