feat: Add Discord Team features

[azep-ninja]

Relates to:

PR 957

Risks

Low: Additional settings to character.json types are low level changes, and should not break any core functionality. Additionally discord messages.ts and file additions are specific to the new team settings, so risk is low.

Background

What does this PR do?

Enhances the Discord bot's message handling to support:

1. Team-based agent interactions - allowing multiple agents to coexist and coordinate responses
2. More natural conversation flow in team contexts
3. Improved interest management for multi-agent scenarios

What kind of change is this?

Features (non-breaking change which adds functionality)
Improvements (misc. changes to existing features)

Documentation changes needed?

My changes require a change to the project documentation.

Add documentation for team-based interaction features

Testing

Where should a reviewer start?

1. Review changes in messages.ts (Discord) particularly:

• Team logic handling in handleMessage
• Updated _shouldIgnore and _shouldRespond methods
• New configuration option handling

Detailed testing steps

1. Test single agent mentions-only mode:

• Verify agent only responds to direct mentions
• Verify no responses to non-mention messages

2. Test team functionality:

• Configure multiple agents with isPartOfTeam: true
• Verify only mentioned agent responds to direct mentions
• Verify team leader handles team-wide requests
• Verify proper conversation handoff between agents
• Verify natural conversation flow (no duplicate responses)

3. Edge cases:

• Test with incorrect/missing team configuration
• Test with mixed team/non-team agents
• Test conversation handling with multiple users

ninja_dev - Discord Username