4a1e666365
- Remove FileReceive struct; use File everywhere with nullable FileMetadata* - Remove struct stat from File; file size lives in Data->size (data_create_reserve) - Add FileMetadata struct (mode, uid, gid, mtime) sent conditionally over wire - Add -M / --preserve flag to client - Restore permissions, ownership, timestamps on disk write - Wire format uses per-file present flag for metadata (zero overhead when off)