Why: Provider repos merged for T1 (core PR#2, agent-command PR#2, frontend
PR#3, ui PR#3, documents PR#9); gitlinks pinned to those mains. The
task-finish guard prevents a repeat of the T0 incident where running
finish from the main checkout deleted it (scripts/task.sh treated $PWD as
the worktree to remove).
Evidence: make test green on the pinned combo — core, backend 13 pkgs,
frontend 9, ui 6, agent-command (vet + tests incl. conformance); make build
produces the binary; combo version string now includes agentcmd SHA.
Impact: combo grows its version traceability; AGENTS.md documents the
worktree-cwd requirement for finish.
Refs: modules/documents docs/records/2026-09-30-t1-core-cards-commands-verification.md