Phase 2 of the decision surface: the pre-snapshot loading state ruled
2026-07-29 (02 § Launch and window lifecycle), built. The board window
appears immediately at its saved frame, titled with the registry
record's cached name, its content a centered spinner behind an
injectable ~200ms grace — no skeletons, and the first snapshot snaps in
place. The tree walk runs off-main via BoardStoreRegistry.acquireOffMain
(per-board single-flight keyed by file identity — concurrent opens of
one root share a walk, restoration of many boards is genuinely
parallel), landing in BoardStore's new designated init(rootURL:loaded:);
the self-walking init survives as a convenience for its ~470 callers.
⌘W during the walk is real: configureWindow split into a loading half
(frame restore, frame tracking, close interception — installed before
the walk) and a store half (toolbar, widget, hideTitle, undo — installed
at the snap), and the walk lives in an explicitly held BoardOpenWalk so
the user's close and SwiftUI's teardown end in one cancel().
Cancellation is discard-on-completion: nil from acquireOffMain means
nothing was built, nothing retained, and no open-now flag was ever set.
Failure keeps today's sequence exactly: record the launch failure,
welcome's row carries it, the window retires.
Claude-Session: https://claude.ai/code/session_01CqjXB7ASoWtbyoGod68k97
rzen
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