The `/` path has had a completion cache since the skills-scan work; the `@`
path never got one. Every keystroke was an uncached round trip behind the 60ms
debounce, so walking a tree — Tab in, Backspace out, retype a segment — paid
full price for paths it had just listed.
Measured in-process against this repo (8,036 files): `git ls-files` ~38ms,
ranking ~12ms. The backend already caches the file list for 5s, so the fix
belongs in the renderer: reuse the existing cache module with a short 15s TTL
(a directory listing, unlike the command catalog, can change under the user)
keyed on cwd + session + query, and wire `isCached` so a warm query skips BOTH
the debounce and the loading state.
That last part is what makes it feel instant rather than merely fast — a
spinner over an answer already in hand reads as latency the user isn't paying.
Brooklyn Nicholson
c17053c4f7