Simplify pass over the 2026-07-04 session (12 findings applied)

Four parallel reviewers (reuse/simplification/efficiency/altitude) audited b340b6f..HEAD; all twelve surviving findings applied under the byte-stability law (fixtures 1047-stable except one justified drift):

• state-engine mp() param-reader: 101 clamp-idiom sites collapsed across the fleet/tb303/mellotron cases (||-semantics and cross-derived keys deliberately untouched)

• resolveMulti: the pure-copy dominant-parent dims (sampleEvents/ reverbColor/autoTune/masterComp/introMode) collapsed to one registry loop over one hoisted top; vestigial empty NO_AUTO_GENRE set deleted.

• csd-engine matchSec regex compiled per-spec, not per-section.

• genre-verifier exports scoreRow; genre-tool imports it instead of carrying a copy of the scoring formula (matrix stdout diffed byte-identical)

Verified: verify.sh quick + full PASS; live smoke PASS (0.986, balance green); press determinism and djMix output md5-identical through the WAV refactor.

▶ Play it: Jackhammer Communion → Shrapnel Lullaby — a shuttle between the two genres this change names — the blend is the point https://stellate.app/?genre=gabber&seed=3715&path=1809.17533,1811.18518&xdur=0.761

90bf6a6 https://github.com/aboard-io/stellate/commit/90bf6a63194a69ffef4ba2006c2b76b8a7dbc755