Three tests validating the full client-server input path through a
live server: movement roundtrip (MoveNorth/MoveEast with position
verification), interact roundtrip (unit variant accepted as no-op),
and mixed sequence (movement then interact preserves position).
Catches integration seams that unit tests miss — each test spawns a
real server binary on a random port, connects via LocalBridge, and
exercises the TCP→deserialize→simulation→snapshot→decode pipeline.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.6
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