Declare-and-halt coordination for a fleet of agents working one repo across many machines — claim a lane before touching it, halt if it's already claimed, release when done. Use when more than one agent or machine could work the same repo, the user mentions "lane", "lane claim", "fleet coordination", "two machines on one lane", or agents are colliding across machines. Differentiator - IDC-only; solves cross-machine collisions that worktrees (same-machine only) structurally cannot touch.
