- Refactor transport to track temp connections separately from authenticated
- Add assignIdentifierToTemp() for hello phase (pre-auth)
- Add promoteToAuthenticated() that closes old connection only after new one auths
- Add removeTempConnection() for cleanup on auth failure
- Update runtime to use new API: assignIdentifierToTemp() on hello, promoteToAuthenticated() on auth_success
This prevents an attacker from kicking an authenticated connection with just a hello message.
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