test: add longbow_water and longbow_alt_theme replay tests

Two new replay files for regression testing:
- longbow_water: longbow fired at water (no terrain collision)
- longbow_alt_theme: longbow on a different theme (non-zero map_seed)

Expected logs generated from unmodded WA.exe 3.8.1 (Steam).
These replays exposed hook-level bugs (FireWeapon, ReplayLoader)
that the original longbow replay didn't trigger.

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

testdata/replays/longbow_alt_theme.WAgame

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testdata/replays/longbow_alt_theme_expected.log

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testdata/replays/longbow_water.WAgame

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testdata/replays/longbow_water_expected.log

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