DRAG-PERF-ANALYSIS.md: a full read of the drag/drop pipeline against
DRAG-REORDER.md's model and RENDER-INSTRUMENTATION.md's measurements,
prioritized and sequenced, nothing implemented yet. The headline: the
per-sample arithmetic is microseconds on any realistic board, and the felt
latency lives almost entirely in the release — a 200ms watcher debounce
plus a whole-strip render pass, with one honesty bug able to stretch a
failed drop into a 1.5-second freeze. P1 is a surgical FolderWatcher
expedite for the echo the bracket already owes (~180ms off every drop),
with the races analyzed benign.
Claude-Session: https://claude.ai/code/session_014PtZdPwqZuqEDLc6wZMtEy
