feat(presets): wire families + live default

Wire the hand-authored families into the 84 presets and make the launcher
boot the live section.

Changes:
- patterns_for: strip the _intro/_live/_outro suffix before the
  PRESET_FAMILY lookup, so all 84 section presets resolve to their
  morceau's family.
- PRESET_FAMILY: retarget mel families to the new banks where they fit -
  house (detroit/rave/trance/melodic/electro), psy (hypnotic/psytrance/
  minimal), dub (dub_techno/melodic_deep), ambient (ambient_intro); drum
  families now style ride/shaker/clap/perc per dfam.
- launch_concert.sh: MATRIX_PRESET default -> techno_drive_live.

Impact: genre presets now use the authored families. test_families PASS,
test_sections PASS, regen deterministic, VALIDATE PASS 84/84.

launcher/concert/launch_concert.sh

@@ -28,7 +28,7 @@ PY="$REPO/data_only_viz/.venv/bin/python"
 SCLANG="/Applications/SuperCollider.app/Contents/MacOS/sclang"
 # matrix preset auto-loaded on boot (a sound_algo/.../matrix_presets/*.matrix name
 # without extension); set MATRIX_PRESET="" to start from an empty grid.
-MATRIX_PRESET="${MATRIX_PRESET:-techno_drive}"
+MATRIX_PRESET="${MATRIX_PRESET:-techno_drive_live}"
 
 notify() { osascript -e "display notification \"$1\" with title \"AV-Live Concert\"" 2>/dev/null; }