istos
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A phase is a card with Type: Phase and a ## Cards section listing its members in run order; members carry Depends on, which guards rather than orders. It runs on its own branch, each member branched from the phase tip so card two sees card one's work, merged back on green, one PR into main at the end — the human gate moves from every card to the phase boundary, and 'the board never merges' stays true of main.