feat(tui): stack the sky over the log at 2:1, retire the starfield [spec 10]

[wine-fall]

Implements specs/spec10/10-tui.md §3.3 (stacked recomposition) / §3.6.

What changed

• Wide composition stacks: the sky is now a full-width scene band over
  the program log at scene:log ≈ 2:1 (sceneSplit, log floored at six
  rows), replacing the side-by-side split. Now-playing keeps its centred
  tricolor line, directly under the scene.
• Overlays reclaim the band: while a spotlight card or the settings
  pane is open, the scene steps off the stage (and the raster figure/wave
  leave with it), so a 24-row terminal keeps every interactive row —
  found by the closing peer review, verified by a 100x24 /settings pty
  smoke.
• Starfield retired: character-cell scatter read as noise (design
  session 2026-08-12, real-frame previews). The night behind the wave and
  the figure stays empty; the wave's particle treatment (arc bases, heat
  tiers, frayed tips, ghost echoes) and the raster figure/ripple pipeline
  are untouched — geometry re-anchored to the full-width band only.
• Narrow (<96 col) terminals keep the classic bottom band, bit for bit.

Evidence

• Unit gate: 768 passed / 1 skipped; typecheck + oxlint green.
• Real-frame smoke (pty, STUB engine, 200x50 + 100x24): scene owns rows
  3..32, log confined below, figure raster centered on the frame
  (anchor 12,93 for a 126px sprite), full-width rule transmitted
  (byte-level, identical to a main-branch A/B capture), /settings pane
  fully visible on 24 rows. Raster wave is a mechanical skip under the
  pty (no pixel-size report — identical on main).
• Peer review (codex gpt-5.5 xhigh): 2 findings, 2 applied (overlay row
  reclaim; comment hygiene), 0 dismissed.

Owed to the by-ear pass (issue #79 checklist)

Real-ghostty look of the stacked band: raster ripple geometry at full
width, scene/log ratio feel, the scene-yield transition when a card or
/settings opens, and the (replay-artifact-suspected) strip rule.

AI coding brief

• Original request: rearrange the existing TUI elements — the right
  panel's pet + particle wave move to a top band, dialogue shrinks to a
  ~2:1 picture:transcript split — keeping every existing animation and
  effect; only the layout moves. Preceded by four design-mockup rounds
  that settled the direction (starfield out, particle wave and raster
  figure sacred).
• Manual interventions: the user rejected two mockup rounds (dialogue
  must shrink, not the scene; keep the settled particle effect; logo must
  not blur) — the lesson folded in was to preview with the real render
  pipeline instead of HTML approximations before asking for approval.
• Retro: pinning "which pixels are sacred" (wave algorithm, raster
  pipeline) in the first prompt would have saved two mockup rounds; the
  pty+pyte smoke caught a real yoga-shrink layout bug a hand mockup never
  would.

🤖 Generated with Claude Code