Module atomic_write 

Atomic file operations with cross-platform support (FR-FS)

This module provides atomic file write operations with:

• Temporary file creation with fsync
• Atomic rename (same filesystem)
• Windows rename retry with exponential backoff (≤ 250ms total)
• Cross-filesystem fallback (copy→fsync→replace)
• Warning tracking for retries and fallbacks

Structs

AtomicWriteResult

Result of an atomic write operation

Functions

read_file_with_crlf_tolerance

Read a file with CRLF tolerance (FR-FS-005)

write_file_atomic

Atomically write content to a file using temp file + fsync + rename