efbf98ecf2
Workstream C of the position-circle tooltips sprint (sprint complete). Per-seat (not per-gamer) significators for a CARTE solo owner, WITHOUT flipping the SigReservation (room,gamer) unique constraint (which the recon confirmed would break 25+ multi-gamer sig tests + the channels flow). - sig_reserve resolves the active seat from ?seat=N (carried on the reserve URL) when the viewer owns it, else _canonical_user_seat — so the hold/commit targets the SELECTED seat. - When the polarity group is SOLO-owned (the viewer owns every PC/NC/SC or BC/EC/AC seat — a CARTE table), reserving commits seat.significator immediately: the 3-ready countdown can never complete solo. The committed sig persists through a NVM release (which only deletes the provisional row), so the viewer reserves each seat in turn. Advances to SKY_SELECT once every seat has a sig (mirrors sig_confirm's tail). Strictly gated to the solo case — a multi-gamer polarity group still rides the existing countdown contract untouched. - _role_select_context SIG_SELECT branch: overrides user_seat by ?seat (owned) so the overlay reflects the selected seat's role/polarity/deck, and carries ?seat on sig_reserve_url. - FT refined to the real reserve mechanic (in-card OK btn → .sig-reserved) — the RED spec's .sig-card.reserved / single-body-click was a placeholder; behavior verified is unchanged (per-seat sig persistence). Tests: CarteSeatSwitchTest.test_carte_saves_a_significator_per_seat FT green (all 4 CarteSeatSwitch + 7 PositionTooltip now green, no skips); 2 solo-CARTE sig ITs (SigReserveSoloCarteTest); full suite 1602 green; channels consumer tests 5 green (WS broadcast intact); multi-gamer SigReserveViewTest/sig_ready/sig_confirm untouched. [[project-position-circle-tooltips]] Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>