6.2 - Anti-Spam & Economic Throttling

Task ID: 6.2
Phase: 6
Description: Anti-spam mechanics using stake thresholds, rate limits, and posting friction.
Deliverables:
- Rate limiter
- Stake-weighted permissions
- Fee sink logic
Dependencies: 6.1
Estimated Hours: 200
Start Hour: 3181
End Hour: 3400
Bounty (VSP): 740000