litetx (walrust fork)

Local fork of superfly/ltx-rs with litestream compatibility fixes.

Changes from upstream

• Added NO_CHECKSUM flag (0x02) support for reading litestream-produced LTX files
• Updated header validation to skip checksum checks when NO_CHECKSUM is set

Why fork?

Litestream uses HeaderFlagNoChecksum = 0x00000002 for files that don't track checksums. The upstream litetx crate only recognizes COMPRESS_LZ4 = 0x01, causing decode failures.

This fork enables walrust to read litestream backups for migration purposes.