test: add girder replay test (2× Girder, 5× Girder Starter-Pack)

Validates the fire_girder pure Rust port from the previous commit.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

testdata/replays/girder.WAgame

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testdata/replays/girder_expected.log

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