Harmony & Counterpoint

* Improved note-onset tracking so that sustained notes are no longer mistaken for newly attacked notes. * Quarter-note passing tones and neighbor tones are now evaluated from the actual sounding notes before and after them, rather than from adjacent eighth-note grid positions. * Fifth-species dotted notes, rests, ties, eighth notes, final note values, and mixed rhythms are now handled by dedicated validation rules. * Eighth-note pairs are limited to one pair per measure, on beat 2 or 4, with stepwise motion checked within the pair and on entry and exit. * Suspensions are now checked for proper preparation, ties, and downward resolution at the next actual note onset. * Added support for ornamented suspension resolutions in fifth species. * Anticipation of the resolution is now treated as a separate rule violation, while valid 9–8 suspensions are excluded from this check. * Fixed 2–3 suspensions in the lower voice so they are correctly treated as downward resolutions. Upward delayed resolutions are rejected. * Live grading and final grading now use the same validation path, eliminating older duplicated logic.