Dispatch — claude arm

Spawn a worker via the Agent tool. The harness-identical funnel and drive loop live in the /dispatch router — this skill is the spawn template plus this arm's landing mechanics.

Pre-spawn — arm the base, cd into the spawn dir

The worker's worktree is created by doctrine's WorktreeCreate hook (doctrine worktree create-fork), not natively by the harness. The hook discriminates a dispatch worker positionally: a spawn is a dispatch worker iff the Agent payload cwd is the arming dir <coord>/.doctrine/state/dispatch/spawn/. The base it forks is explicit — the base file in that dir — never cwd HEAD. cwd is the discriminator, not the base source.