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Each polarity's 18-card sig pile now assembles from THREE seats by segment, each FROM THAT SEAT'S OWN deck: CROWNS/BRANDS courts (8) from the cb role's deck, GRAILS/BLADES courts (8) from the gb role's, majors 0/1 (2) from the tr role's — levity cb/gb/tr = PC/SC/NC, gravity = BC/AC/EC. So an RWS King of Grails (SC seat) can sit beside a Minchiate Queen of Wands (PC seat) in one levity pile, each carrying its own deck_variant -> per-card face/back art, NO schema change (cards already carry deck_variant). - models.py: new _POLARITY_SEGMENT_ROLES + _seat_deck_for_role + _court_cards + _major_cards + _polarity_sig_cards. A missing seat/deck falls back to _room_deck_variant, so a single-deck (or CARTE-solo) room assembles the IDENTICAL 18-card pile it always did (16 courts + 2 majors). sig_deck_cards is now the UNION of both polarity piles (note-unfiltered) -> select_sig's pick validation (views.py:1664) accepts a card from EITHER deck/polarity with no view change. Dropped the now-dead _sig_unique_cards; _sig_unique_cards_for_deck stays for personal_sig_cards (my_sign, single equipped deck). - TDD: DubbodeckAssemblyTest (4 ITs) — levity grails/blades come from the SC seat's distinct deck while crowns/brands stay earthman; the gravity pile is unaffected by a levity-seat deck; the validation set spans both decks; CARTE-solo one-deck feeds BOTH polarity piles sharing pks (no cross-polarity dedup). Existing SigDeckCompositionTest (36/16/16/4) + SigCardHelperTest (single-deck counts, note unlocks, share-pks, empty fallback) green — single-deck behavior preserved. 736 epic+drama ITs green. - bundled (parallel work): rootvars.scss ongoing palette tuning. [[project-deck-segment-model]] [[project-image-based-deck-face-rendering]] Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>