Off-by-one in all four signed int branches: upper bound used <= instead
of < (e.g., value <= 128 matched int8 instead of falling through to
uint8). Tick 128 was encoded as int8 -128, causing server deserialization
failure. Also remove stray debug prints from nil/false decode paths.
Fixes bug #4 (MessagePack encodes tick 128 as -128).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Install Godot4MessagePack (pure GDScript) for MessagePack encode/decode.
Add Rust fixture generator (gen_fixtures.rs) that produces canonical
.msgpack files using rmp_serde::to_vec_named for cross-language testing.
Fixtures cover: snapshots (empty, one NPC, multi-entity with all
EntityKind variants) and player inputs (unit + data enum variants).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
jpmschweitzerandClaude Opus 4.6