v0.2.4

What's new

• mc.setStatus() / mc.removeStatus() — custom status bar items below the input box (like Pi's ctx.ui.setStatus)
• mc.setTheme() / mc.getTheme() — full UI color customization from extensions (15+ color tokens)
• Concurrent async commands — fixed extension host to handle responses while commands are running
• Kitchen-sink example — full demo extension using every SDK feature: themes, status bar, input interception, tool blocking, shell execution, state persistence, lifecycle events, custom commands
• Tokyo Night & Dracula theme presets included in the example