Design doc audit: update badges, fix outdated descriptions, add CDN/replication docs
Badge updates:
- BlobHeader: Planned → Complete (has receipt/comment slots, reactions, policy)
- LAN Discovery: Planned → Complete (iroh mDNS integration)
- UPnP TCP: Planned → Complete (both UDP+TCP renewal cycles)
- HTTP Post Delivery: added Complete badge
Description fixes:
- Share links: removed hostlist encoding, added tiered serving (redirect → punch → proxy)
- Eviction formula: added share_boost factor (+100 for 3+ downstream)
- Message types table: added ReplicationRequest/Response (0xE1/0xE2), count 41 → 49
- Engagement: added tombstone propagation description
New sections:
- Device roles & bandwidth budgets (Intermittent/Available/Persistent)
- Active CDN replication (10-min cycle, target prioritization, graceful degradation)
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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