| Finoan |
This is kind of the other side of the same coin as some other discussions had recently.
A Sorcerer Spellcasting class feature and Sorcerer Repertoire is a different thing than a Summoner Spellcasting class feature and Summoner Repertoire.
A dual-class character would get both - separately and unmodified by anything from the other class.
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One thing I would note is that if you use the Learn a Spell activity for a spell that qualifies for both caster classes, then you would know the spell for both. It would require separate Downtime/level-up activities to swap in the spell into Repertoire for the two classes if you wanted the spell available for all of your dual-class spell slots. But I would only make you pay the gold cost and skill check once.