Completes the command-palette acceptance: the filter is now a
subsequence fuzzy match (was substring), and recently-invoked commands
float to the top and break score ties. The subsequence matcher is
extracted to a shared fuzzy helper so the palette and quick-open file
finder use one implementation instead of a private copy each.
Pinned commands and cross-session recency persistence are left as a
follow-up (they need a pin affordance + settings storage).
Co-Authored-By: Claude <noreply@anthropic.com>
jpmschweitzerandClaude
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