Include mentioned users in message events

[DevRohit06]

Problem

When discli emits message events (both listen and serve commands), it includes mentions_bot to indicate whether the bot was mentioned, but it does not include the full list of mentioned users in the event payload.

Discord's message.mentions contains all @mentioned users as full Member/User objects with .id, .name, etc. This data is available but not being forwarded.

Why this matters

Downstream consumers (like PocketPaw's Discord adapter) need user IDs to:

• Mention users in replies using <@USER_ID> format
• Send DMs to mentioned users
• Resolve usernames to numeric IDs

Without this field, the agent has no way to look up a user's ID when someone says "mention @john" or "DM @john" -- the raw content contains <@123456> but there's no structured way to map usernames to IDs from the event data alone.

The MCP server exposes discord_member_info for this, but that's only available to MCP-capable backends. The event payload itself should carry this information since Discord already provides it.

Suggested fix

In commands/listen.py (line 68-82) and commands/serve.py (line 126-142), add a mentions field to the event data:

"mentions": [{"id": str(u.id), "name": str(u)} for u in message.mentions],

This would make the event payload look like:

{
  "event": "message",
  "author": "someuser#1234",
  "author_id": "111222333",
  "content": "hey <@444555666> can you help?",
  "mentions_bot": false,
  "mentions": [
    {"id": "444555666", "name": "john#5678"}
  ]
}

Files to change

• discli/commands/listen.py -- on_message handler
• discli/commands/serve.py -- on_message handler