Perform emergency token compaction for the Agent Collective workflow.

When token usage exceeds 80% capacity:
1. Summarize all completed phases into compressed references
2. Archive non-essential context to artifacts/archive/
3. Reset active memory while maintaining critical dependencies
4. Update STATE_MANIFEST.md with compacted state
5. Report token savings achieved

Use the following format:
- Before: [previous token count]
- After: [new token count]
- Savings: [percentage saved]
- Archived: [list of archived items]

$ARGUMENTS
