Flow fills the closest open sink then spills onward; control is open/close plus thinker placement, no priority menu. The Act One bootstrap needs no carve-out: the camera's sink starts open, so the first THINK toggle is the Eyes splice itself. Defense: dated decisions on machine-work.md's core-sink and ops bullets and act-one.md's Eyes beat per Cameron's calls; ROADMAP #33 [OPEN] list trimmed; no src change — implementation rides #33.