Phases are meant to arrive whole — members listed, dependencies filled in, readable in a diff before any of it runs. This is the other case: the card you decide belongs after all.
⟶ phase sits on backlog/ and to-do/ cards that are not already in a phase and are not phase cards themselves, and opens a sheet naming the phase cards waiting in to-do/ with what each already holds. Picking one appends `- <n> — <title>` to the end of that phase's ## Cards — the way a person writes it, because the section is authored and read by hand and a machine-shaped line is how a format stops being pleasant.
Only to-do/. A phase in in-progress/ is running: its branch exists and its members are being worked in the order the list had when it started, so appending mid-flight is a different feature with different questions. Offer it and someone finds that out the hard way. No phase waiting there and the action is absent rather than present and empty.
Nothing else moves. One line into the phase card, nothing at all into the card added — membership runs one direction and joining a phase is not a commitment to start it. The append goes out through append_to_section, the same door the phase log uses, so it commits itself under BOARD_COMMIT_MOVES, reaches the other boards, and reads the phase card off the disk rather than off a render: two boards adding to one phase produce two lines, not a lost one.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
