WriteTool fails to assign secure permissions to sensitive files

[n24q02m]

The problem

There is a failing unit test in test/tool/write.test.ts called sets file permissions when writing sensitive data. The WriteTool currently writes all files with default permissions and does not restrict access to 0o644 or 0o600 when creating or editing sensitive files like .env or sensitive.json.

Steps to reproduce

Run bun test test/tool/write.test.ts on unix.

Expected behavior

The test should pass and files ending in .env, .env.local, or sensitive.json should receive restricted read/write permissions for security.