handoff

# Handoff Operator interface for **two-session execution**: one session plans (`session=two` at the Step 0 gate), a second session in another environment builds, and the first session reviews. The lifecycle and package format are defined in [`../hyperflow/session-handoff.md`](../hyperflow/session-handoff.md); this skill is the thin set of verbs over it (mirrors how `/hyperflow:flush` fronts the deferred-commit machinery). Packages live at `.hyperflow-handoff/<slug>/` (committed, so they travel via git). `STATUS` (`planned → built → reviewed`) is the single source of truth and decides which side of the handoff you are on. ## Subcommands ### `list` Read-only. List every `.hyperflow-handoff/*/` (excluding `.archive/`): slug · `STATUS` · `on_complete` · age. Group by status so the user sees what is awaiting build vs awaiting review. ### `status [<slug>]` Show the `HANDOFF.md` manifest + `STATUS` for one package (or all). When `STATUS=built`, also print the `COMPLETION.md` diff range and commit count. Read-only. ### `pickup <slug>` — build side Thin alias for starting the second-session build: invoke `Skill` with `skill: dispatch` and `args: "<slug>"`. Dispatch's Step 1.0 rehydrates `artefact/` into `.hyperflow/`, runs `/hyperflow:scaffold` if the cache is missing, builds the batches, writes `COMPLETION.md` + `STATUS=built`, and then deploys or stops per `on_complete`. ### `review <slug>` — planning side 1. Require `STATUS=built` (else: "handoff `<slug>` is `<status>` — not...