fix: Update pre-commit hook for husky v10 compatibility

Remove deprecated shebang that will fail in husky v10.

Before (deprecated):
  #!/bin/sh

After (v10-compatible):
  Direct commands without shebang

Ref: https://github.com/typicode/husky/issues/1476

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

.husky/pre-commit

@@ -1,3 +1,2 @@
-#!/bin/sh
 npx lint-staged
 npx git-secrets --scan || echo "Warning: git-secrets not installed"