List cards due at asOf (Markdown)

Routine read. Prompts only. answerIncluded is false. Each card includes deckNote and cardNote. Coaching notes are instructions for how an agent should quiz and coach. They are not the answer, not graded content, and not the quiz prompt. A deck note applies to every card in that deck. A card note is optional and additive with the deck note. Retrieve responses (listDue, upcoming-new, inventory, getCard, reveal, and agent session start/next/grade) include deckNote and cardNote so one call carries coaching context. Scripture / dictation: The learner needs every word remembered correctly, but often answers via dictation where punctuation gets messy. They set a deck note instructing the agent to check every word exactly, but not fail on punctuation differences, and to include that reason when coaching. This is only an example — notes can be any coaching preference for how agents should quiz/coach for that deck (or a specific card). due is ordered learning, then review, then new. The new queue introduces at most the deck's newCardsPerDay cards for this study day. A new deck has no silent default of 20. newCardMode=extra with extraNew appends past-cap new cards. Do not fold reveal into this call.