first-tree-seed

Bootstrap a team's Context Tree from readable source repos — for an onboarding \"build / set up the Context Tree\" task on a tree that has no domain structure yet: either no tree exists (creates and binds it) or a bound-but-empty tree (fills it). Supports clean explicit-Team invocation without a Workspace manifest, managed briefing, or prior setup-chat transcript, while preserving managed-workspace compatibility. Proposes an initial top-level + second-level domain structure for approval, then drafts initial leaf content — each as a reviewable PR/MR. Refuses unrelated re-seeding once the tree has domain structure and recovers Phase 2 from durable merged Tree state plus the same explicit sources.