Airframe theme-v12

The new Fleet look and the decision deck (KAN-140, KAN-139): soft geometry, one step of lift, sentence-case sans labels,
motion tokens, and attention as edge, mark, word instead of a status-tinted box with an orange ring. From the hangar
Fleet direction "6, Decision deck". No token is renamed or removed; every class from theme-v11 still resolves.

Changed token values:

• radius-control 2px → 8px; radius-card 4px → 12px. Buttons, inputs, chips, tags, segments and tiles soften; cards,
  rows and panels take 12px. The denied placard keeps a 4px corner.

New tokens:

• Surface: lifted (Night #1C1C1C, Day #FFFFFF), the one step above raised for what is open or on top; edge-hi
  (Night rgba(255,255,255,0.045), Day #FFFFFF), its 1px top highlight.
• Shadow: shadow-1 (resting lift; Night 0 1px 2px rgba(0,0,0,0.5), Day 0 1px 2px rgba(0,0,0,0.06)) and shadow-2
  (an open sheet or the top card of a deck; Night 0 20px 60px rgba(0,0,0,0.6), Day 0 16px 48px rgba(0,0,0,0.14)).
  shadow-overlay is unchanged and now also covers toasts.
• Radius: radius-sheet 18px.
• Rail: rail (Night #2A2A2A, Day #E3E3E0), rail-done (Night #D6D6D6, Day #2A2A2A), rail-glow (Night
  rgba(255,255,255,0.25), Day rgba(0,0,0,0.12)), rail-h 2px.
• Motion (new family; DTCG duration and cubicBezier): dur-fast 120ms, dur 200ms (was a 160ms constant in base.css),
  dur-open 300ms, ease cubic-bezier(.2,0,0,1), ease-open cubic-bezier(.32,.72,0,1). Under
  prefers-reduced-motion the three durations read as 0ms and every transition and animation is off. Tailwind gains
  ease-airframe and ease-open.
• brand-wash is deprecated: no Airframe rule uses it any more. It still resolves, unchanged, for older product CSS.

Type: label and label-s are sentence-case Red Hat Text (12/1.2 and 11/1.2, 500, no tracking); the mono capitals are
retired. af-lbl, af-btn, tabs, keys, table headers, stage words and the trace/iconset headings follow. Mono stays for
IDs, numbers, commands, the denied placard, the lamp legend and the terminal bar. af-btn--text is now a no-op.

Attention (airframe-components.css): every status color-mix() wash and inset outline is gone. af-card--lit,
--failed, --denied, af-stand, af-bay, af-mini, table and list rows (is-attention) keep a neutral ground and
take a 3px status edge on the leading side; selection is neutral (selected, a 1px fg ring on tiles, a 2px fg edge
on rows and trace and lane rows) where it was brand-wash and a yellow ring. The failed trace span loses its tint.
Danger buttons are red words with no red border (af-btn--danger af-btn--secondary for a hairline). Forced colors: the
edge is a 3px CanvasText border.

New components and classes (runway.css, a new stylesheet with its own forced-colors block):

• DecisionDeck (af-deck, af-decision, af-reason, af-verdict-line): one decision at a time, ordered by expiry.
• AgentRow and AgentCard (af-runway, af-board, af-agent, af-console): the List and Board views, opening in
  place. ActivityTimeline (af-timeline), StageRail (af-rail, af-ring, af-capsule, with --est for an
  estimate), Heartbeat (af-hb), and FleetConsole, the composed Fleet page.
• af-nav__badge: the orange Needs-you count. FleetView, FleetBays, FleetColumns and FleetOwners keep their classes and
  fold onto the neutral tile and the edge; hangar's default pair is List + Board.

airframe.js: duration(name), expand.open/close (open in place, Escape, focus return), deck.next/prev/go/leave
(the deck, firing af:deck) and roving(root) (arrow keys by visual row).

Accepted bends, documented in guide/Status.md: the orange count badge, the heartbeat pulse (recency, not status; still
under reduced motion) and the rail-head glow.