- YNX-0903: Add sendMessageToServer() and sendRuleMessage() to Client runtime
- YNX-0904: Add sendMessageToClient() and sendRuleMessageToClient() to Server runtime
- YNX-0905: Implement handleRuleMessage() for server-side message rewriting
with sender identifier injection (::::)
- Update TASKLIST.md to mark all 3 tasks as completed
- Add Yonexus.Protocol/src/codec.ts with encodeBuiltin/decodeBuiltin,
rule message parsing, and type-safe envelope builders
- Add Yonexus.Server/plugin/core/persistence.ts with ClientRecord,
ServerRegistry, and serialization helpers
- Update exports in both modules