Feature: Pairing history command for users

[LBC970]

Description

Allow users to view their own pairing history and stats via a slash command.

Proposed Command

/coffee-history or /coffee-admin history (user-facing, not admin-only)

Features

• Show who the user has been paired with and when
• Display their badge level and progress to next level
• Show total participation count
• Optionally show "suggested next pairing" (who they haven't met yet)

Example Output

Your Coffee Chat History

Badge: ⭐ Coffee Enthusiast (8 chats)
Progress: 4 more chats until Coffee Veteran 🏅

Recent Pairings:
- Dec 20, 2024: Alice Johnson
- Dec 6, 2024: Bob Chen
- Nov 22, 2024: Carol Davis

People you haven't met yet: David Kim, Eva Martinez, Frank Wilson

Technical Considerations

• Need to look up user's display name from their Slack user ID
• Query pairing history from S3
• Could be a new slash command or subcommand of existing /coffee-admin
• Should this be ephemeral (only visible to requester) or public?

Privacy Consideration

• Users should only see their own history, not others'