Fingering numbers must not overlap slur curves, articulation marks, ties, or ornaments at the same note

When a note carries fingering AND a slur/articulation/tie/ornament, the engraver shifts one or the other slightly (typically the fingering, being smallest and most flexible) so neither glyph visually overlaps the other — Gradus's MelodyNote already supports articulation, ornament, tie, and graceNotes on the same note as fingering (confirmed in the type declaration), so this collision is a realistic, frequent case, not a rare edge condition.

A note authored with both articulation: 'staccato' and fingering renders (once fingering rendering is implemented) with the staccato dot and the fingering numeral occupying overlapping space, since both conventionally sit close to the notehead on a similar side.

Gould general collision-avoidance principle applied to fingering specifically; Ross (general principle: no two engraved elements share the same visual space without explicit justification).

This rule is about where marks land on the page, so it can only be judged after engraving. Collision and spacing faults live here.