This plan outlines how to add a "/" command menu to the agent panel
that appears when users type "/" but only if the ACP agent supports
custom slash commands.
Key phases:
1. ACP Protocol Extension - Add new RPC methods and capabilities
2. Slash Command Menu UI - Add "/" detection and searchable menu
3. Agent Implementation Support - Help agents implement new methods
The plan includes proper protocol extension since we can modify the
agent-client-protocol crate, making the implementation much cleaner
with full type safety across the protocol boundary.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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