feat: Squad Replay — interactive collaboration playback

[tt-a1i]

Summary

Record a multi-agent collaboration session and export it as a shareable, interactive timeline.

Usage

squad replay --export timeline.html

Output

A single-file HTML page containing:

• Message timeline: Shows each agent's messages in chronological order
• Task Gantt chart: Visualizes task creation → ack → completion lifecycle
• Agent activity: Who was active when, idle time, bottlenecks

Use Cases

• Team retrospective: Identify where collaboration stalled or which agent underperformed
• Teaching/demo: Show others how multi-agent collaboration works in practice
• Content creation: Use as video material or blog illustrations

Implementation

• All data already exists in .squad/messages.db (messages, tasks, agents, timestamps)
• Build an exporter that queries the DB and generates a self-contained HTML with embedded JS/CSS
• Could use a lightweight timeline library or plain SVG

Complexity

Small-to-medium. Data layer is done; this is mostly a read-only export + HTML template.