rustymotors / server

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Add multi-client test harness with real queue integration tests

TestClient wraps real MessageQueue instances so relay/broadcast handlers
can be tested end-to-end without mocking getSocketQueue. Existing handler
unit tests mock getSocketQueue; these tests verify packets actually flow
through the real queue infrastructure.

MultiClientSession coordinates N clients sharing ChannelMembership state.
npsMessages.ts provides packet builders derived from our own session
captures and server-side parsers.

Five scenarios covered via real queues:
- SEND_SINGLE_LONG delivers rewritten 12-byte envelope to target only
- SEND_SINGLE_LONG skips self-delivery
- SEND_BUDDY_LONG delivers to buddy connection
- SEND_NOT_SINGLE_LONG broadcasts to all except sender and excluded user
- SEND_NOT_SINGLE_LONG delivers to nobody when channel is sender+excluded only

Also exports _resetChannelMembership from rusty-motors-shared/test for
cross-package test isolation.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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