Selection: exactly ONE card carries .is-selected; clicking another moves it. Pane (desktop): selecting a card pushes the content column — the pane never covers; the X releases + closes. Complete-advance: a send ARMS (.tp-armbar countdown); commit fires the locked done grammar + auto-advances to the next task in the band — the board scroll never moves. Band collapse persists (angle flips, count stays). Archived expands from its rail in place, collapses back. Mobile: the pane law inverts — the task sheet covers full-screen (grab handle + .mh bar); closing preserves board scroll (sacred-scroll). These captions are the source of truth; the figures below force each state statically. One right panel at a time. The desktop board has two right-side panels — the task pane (card click) and the Filters panel (Filters chip). Both use the same .ix-pane push mechanics (content-col narrows, pane docks 424px on the right; never covers, never a scrim). Opening one closes the other: selecting a card closes Filters + clears its chip; opening Filters closes the pane + clears the selection. On mobile the DetailPage law inverts — the Filters panel opens as a full-screen sheet (.tk-fsheet, covers), exactly like the task sheet. The panel itself is the locked FilterPageForm grammar (see comp-tasks-filter). Ruling 55 — selection bug fixed: a task appears in exactly one band and exactly one card carries .is-selected (the earlier duplicate-across-bands double-selection is gone). Selecting pushes the pane in at 424px (flex sibling; content-col narrows; no scrim); board scroll never moves; the pane opens on the task’s TYPE. Ruling 56 — compact re-spec: the compact card is the regular card with the footer killed — R1 radio · title · due · .sb-cardmenu kebab; R2 type glyph · customer name; same paddings + co-axial spine as the full card (the missing-padding squeeze is fixed); comment-count dropped. Eng notes: isUrgent boolean (pin + drag); To-Do band = everything not pinned/done, orderBy overdue-first; Done by completedAt; pane advance = next incomplete task. Board (desktop): status columns To-Do | Done | Archived, urgency bands stacked inside To-Do, pane CLOSED by default. The live immersive prototype is comp-tasks-desktop. Board structure: status columns To-Do (flex 3, work surface) | Done (green-02) | Archived (collapsed .sb-leadrail). Inside To-Do only two stacked urgency bands — Urgent (pin, red; always renders, empty = drag-to-pin) and To-Do (neutral, overdue-first); Overdue/Due-Today bands were dropped — the card’s urgency-colored due chip carries overdue/due-today. Cards are WHITE on the board (color-on-lane law) and carry no urgent chip. Live contract: card click → single .is-selected + pane push (content-col narrows, no scrim); the Archived rail expands/collapses in place; band headers collapse (angle flips, count persists); the Compact toggle flips the whole board; and the sacred-scroll law — opening/closing the pane never moves the board scroll. Board (mobile): a scroll-snap pager — To-Do (Urgent + To-Do bands) · Done · Archived, one page per swipe. The live immersive prototype is comp-tasks-mobile. Task sheet (DetailPage mobile law): the pane COVERS full-screen (never pushes like desktop) — grab handle + locked .mh bar + the shipped pane content (card-grammar header · Best next steps · Conversation/Details/Vehicles · pinned Complete Task · composer on the task type). Closing (X or grab-handle) returns to the board with scroll position preserved. The one deliberate desktop/mobile divergence: Archived is a full pager PAGE on mobile, not a collapsible rail — a rail has no home inside a scroll-snap pager. Everything else (bands, cards, compact, sheet content) is the same locked instance as desktop.