Checkpoints / Resume / Handoff

Checkpoints snapshot task state with deterministic resume context and handoff packs, so work survives provider switches and interruptions.

ackit checkpoint create --next-objective "wire gate" --next-path src/core --next-command "pnpm test" --next-expected "green"
ackit checkpoint show
ackit checkpoint validate
ackit checkpoint export --format json --out .ackit/reviews/handoff.json
ackit checkpoint import .ackit/reviews/handoff.json
ackit task resume

Portable handoff v2

ackit.handoff.v2 binds task and workflow state, the checkpoint record, evidence presence, the verification binding (state and bundle digests) with the latest verdict trust summary, checkpoint staleness at export time, the canonical status snapshot (verbatim blockers plus derived next actions), a redaction manifest, and provider-neutral resume instructions. Imports validate against current disk state and stay read-only: fresh handoffs render resume context, moved state refuses with VERDICT-STATE-STALE, v1 markdown refuses with HANDOFF-V1-UNBOUND, malformed files with HANDOFF-INVALID, and unknown tasks with HANDOFF-TASK-UNKNOWN.