Key Detector 1.0.0

Add Key Detector extension wired to current Ableton Extensions SDK

MIDI key/scale detection extension exposing "Detect Key" context-menu
actions on MIDI clips, clip slots, MIDI tracks, and Arrangement time
selections. Detection uses a duration-weighted pitch-class histogram
correlated against major, minor, and modal families, with selectable
Krumhansl-Kessler and Temperley weighting profiles.

Wired to @ableton-extensions/sdk + cli 1.0.0-beta.0 via local file:
tarballs (the beta SDK is not published to npm). Builds via esbuild.js,
which inlines main.css into the results modal.