Adds the autonomous /loop foundation: a headless `hack-house sbx save|publish`
subcommand so a non-TUI operator can persist a built VM to the host library
through the same canonical registry path the room UI uses (no schema drift).
- snapshot.rs: hoist register_saved_snapshot/publish_snapshot/oci_image_size out
of app.rs into a shared module used by both the TUI and the new CLI.
- registry.rs: advisory cross-process lockfile (~/.hh/registry.lock, O_EXCL spin
+ stale-reclaim) around every read-modify-write, plus atomic temp+rename store,
so concurrent /loop wave members can't clobber each other.
- main.rs: `Sbx { Save, Publish }` subcommand wired to the shared snapshot logic.
- skills/hh-loop: the loop doctrine — value rubric, adaptive 1-3 operator
topology, visible-tmux-by-default run flow, --record logs/film, wave scaling,
and safe `tmux -L hh-loop` teardown.
Proven end-to-end: built+verified a stdlib VM in a sandbox, headless
save+publish -> registry entry shareable:true with a portable tar.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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