Replace .lock().unwrap() with .expect("mutex poisoned") in LocalBridge
for clearer panic messages. Document 16MB MAX_MESSAGE_SIZE rationale
in framing.rs with entity count sizing analysis.
Addresses Hoshe PR review suggestions.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
TilePosition component with discrete grid coordinates, flat-storage
WalkabilityMap resource with O(1) can_move_to() lookup, MoveIntent
component and validate_movement system. Movement validated against
walkability map each tick, blocking all NPC and player movement
through unwalkable tiles. 11 unit tests + 1 integration test.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Length-prefixed MessagePack framing (4-byte BE length + payload),
LocalBridge struct implementing SimBridge trait over Unix domain
sockets, BridgeResource wrapper for ECS integration. Adds Io
error variant to BridgeError. Two integration tests verify
snapshot and input round-trips over real sockets.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>