Christian Nennemann eee1e9f278 feat(mesh): add KeyPackage distribution over mesh ...

Implements announce-based KeyPackage distribution for serverless MLS:

- MeshAnnounce now includes optional `keypackage_hash` field (8 bytes)
- CAP_MLS_READY capability flag for nodes with KeyPackages
- KeyPackageCache for storing received KeyPackages:
  - Indexed by mesh address
  - Multiple per address (for rotation)
  - TTL-based expiry
  - Capacity-bounded with LRU eviction
- Mesh protocol messages:
  - KeyPackageRequest (request by address or hash)
  - KeyPackageResponse (KeyPackage + hash)
  - KeyPackageUnavailable (negative response)

Protocol flow:
1. Bob announces with keypackage_hash
2. Alice requests KeyPackage via mesh
3. Bob (or relay) responds with full KeyPackage
4. Alice creates MLS Welcome, sends to Bob via mesh

2026-04-01 08:57:49 +02:00

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