- Add 'mfer export' command: dumps manifest as JSON to stdout for piping to jq etc
- Add HTTP/HTTPS URL support for manifest path arguments (check, list, export)
- Enable --version flag (was hidden, now shown)
- Audit all error messages: wrap with fmt.Errorf context throughout CLI and library
- Add tests for export command and URL-based manifest loading
- Add manifest_loader.go with shared resolveManifestArg and openManifestReader helpers
- Atomic writes for mfer gen: writes to temp file, renames on success,
cleans up temp on error/interrupt. Prevents empty manifests on Ctrl-C.
- Humanized byte sizes using dustin/go-humanize (e.g., "10 MiB" not "10485760")
- Progress lines clear when done (using ANSI escape \r\033[K])
- Debug logging when files are added to manifest (mfer gen -vv)
- Move -v/-q flags from global to per-command for better UX
- Add tests for atomic write behavior with failing filesystem mock
Replace callback-based progress reporting in Builder.AddFile with
channel-based FileHashProgress for consistency with EnumerateStatus
and ScanStatus patterns. Update scanner.go to use the new channel API.
