Engine half: real-git E2E covering planning- and mission-sourced groups —
members land on the group branch (never main/sibling), completion-gated single
PR via injected callback, re-promote idempotency, sync on later landing,
abandon→closed, and a self-healing finalize mid-flow staying group-anchored.
Core half: real triageFeature stamps the BG- id, member enumeration, and the
canonical completion gate flipping on landing.
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