Copilot Chat Integration surface squad context via @squad

[csharpfritz]

Description

Integrate with VS Code's Copilot Chat API to surface team context when users mention squad-related topics. High-impact feature that makes SquadUI a context hub for AI-assisted development.

Approach

• Investigate vscode.chat participant API for registering a @squad participant
• When invoked, provide team roster, recent decisions, current work status as context
• Start with manual trigger (command or chat participant), plan for deeper integration as APIs mature
• Note: public API surface may be limited design for graceful degradation

Acceptance Criteria

• @squad chat participant registered in VS Code Copilot Chat
• Provides team roster context when asked about team members
• Surfaces recent decisions when asked about project decisions
• Shows current work status when asked about progress
• Graceful fallback if chat API is unavailable

Notes

This is a large feature that may need to be scoped iteratively. The chat participant API surface should be investigated first as a spike.

[github-actions]

📋 Assigned to Danny (Lead)

Issue: #77 — Copilot Chat Integration surface squad context via @squad

Danny will pick this up in the next Copilot session.

For Copilot coding agent: If enabled, this issue will be worked automatically.
Otherwise, start a Copilot session and say:
Danny, work on issue #77