Modifiers were sampled only inside resolveOperation, reached from
dropUpdated and the commit — and drop callbacks arrive only while the
mouse moves, so ⌥ pressed against a still pointer changed nothing
until the next twitch. DragSession now arms a local .flagsChanged
watch for exactly the session's lifetime (begin arms, end stops, the
watchdog guarantees end; ⇧/⌃/caps don't count, a settled hold
swallows) and publishes modifierGeneration; the three retargets record
which window's surface resolved the proposal (RetargetOrigin — weak
registry identity, never board root, so cross-board and two-windows-
one-board both answer correctly), and the hovered window replays that
same retarget with the operation re-resolved FIRST, since the index
space is a function of it. The monitor is injectable — the real one
needs a live event stream no test bundle has.
Drag-perf card d491e7d3.
Claude-Session: https://claude.ai/code/session_01CqjXB7ASoWtbyoGod68k97
rzen
1ffb64913b