Initial commit: haul — desktop SFTP client

A two-pane local/remote file browser over SSH, split out of dial so file
transfer lives in its own tool. The two share ~/.ssh/config as their base.

- internal/sshconf: ~/.ssh/config parsing, for the saved-host list.
- internal/sshx: dialling and auth — agent, keys, password, host-key
  verification, ProxyJump.
- internal/vfs: the FS interface both sides are driven through, implemented
  over the local disk and over SFTP.
- internal/xfer: recursive copy engine with progress reporting, cancellation,
  conflict policy, and resume of partial transfers.
- internal/ui: the Fyne GUI — connect window (saved hosts plus quick connect)
  and the two-pane browser session.

Build with `make build`; the Makefile locates the Go toolchain at ~/.local/go,
which is deliberately kept off PATH. Cross-compiling needs a per-target C
toolchain because Fyne is cgo, so `make dist` builds the native binary only —
the alternatives are documented in the Makefile.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

cmd/haul/main.go

@@ -0,0 +1,21 @@
+// Command haul is a desktop SFTP client: a two-pane local/remote file browser
+// over SSH, with ~/.ssh/config as its host list and quick connect for anything
+// that isn't in it.
+//
+// haul was split out of `dial` (the SSH host picker) so file transfer lives in
+// its own tool. The two share the same ~/.ssh/config as their base.
+package main
+
+import (
+	"fmt"
+	"os"
+
+	"gitea.apointless.space/bsncubed/haul/internal/ui"
+)
+
+func main() {
+	if err := ui.Run(); err != nil {
+		fmt.Fprintln(os.Stderr, "haul:", err)
+		os.Exit(1)
+	}
+}