Alt+M mode cycling completely broken in v2.1.3 - cannot switch between any modes

Environment:

• Claude Code v2.1.3
• Windows 11
• VS Code integrated terminal

Expected Behavior:
Alt+M cycles through all three modes: Default → Agent (Edit) → Plan → Default

Actual Behavior:
Alt+M does nothing. Keyboard shortcut is completely unresponsive.

Reproduction Steps:

1. Start Claude Code v2.1.3
2. Press Alt+M - nothing happens (cannot enter Agent mode)
3. Press Alt+M again - nothing happens (cannot enter Plan mode)
4. If you enter a mode manually (e.g., /plan), Alt+M still does nothing
5. No keyboard method to cycle between modes

Regression:

• v2.1.2: Alt+M cycles through Default ↔ Agent ↔ Plan correctly
• v2.1.3: Alt+M completely non-functional

Impact:

• Cannot enter Agent (Edit) mode via keyboard
• Cannot enter Plan mode via keyboard
• Cannot exit any mode via keyboard once entered manually
• Mode switching requires slash commands only