Fix null bytes in style.md skill rule

[reed1]

Summary

• The laravel-best-practices skill rule file style.md contains two null bytes (\x00) where \U in App\Models\User should be, causing git and other tools to detect the file as binary
• This was introduced in Add laravel-best-practices skill #628 — the file shows as Bin 0 -> 4444 bytes in that commit's diff

Fix

Replace the two null bytes with the correct \U character so the string reads App\Models\User as intended (lines 47 and 52).

Verification

# Before fix
$ python3 -c "print(open('.ai/laravel/skill/laravel-best-practices/rules/style.md','rb').read().count(b'\x00'))"
2

# After fix
$ python3 -c "print(open('.ai/laravel/skill/laravel-best-practices/rules/style.md','rb').read().count(b'\x00'))"
0

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