FIX-62: small-graph idle FPS — isolate lagoon backdrop + drop dead lagoon CSS#129
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…d lagoon CSS Profiled idle FPS on a small graph (4 nodes, ULTRA quality): 52 fps, recovering to 59 when the lagoon backdrop is hidden and 60 with all animation off. The static `.lagoon-caustics` backdrop had no compositor-layer promotion, so it was repainted every frame the SVG nodes animate above it — the dominant idle cost on small graphs (the #57 work only size-gated node/edge effects, not the backdrop). - Promote `.lagoon-caustics` to its own GPU layer (transform: translateZ(0); will-change: transform; contain: layout paint style) → idle 52 → 57-58 fps on the same small graph, no visual change. (Verified via an auth'd FPS probe.) - Removed ~125 lines of DEAD lagoon CSS: `.caustic-layer` + `.caustic-layer-1..20` + `.lagoon-shimmer` + `.lagoon-shimmer-2..10` and their `@keyframes` (lagoonCaustics1/2/3, lagoonShimmer) + `--lagoon-shimmer-*` vars — confirmed no DOM element anywhere uses these classes (they animated nothing; a perf red-herring). THE GATE 5/5; no element references the removed classes. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Profiled small-graph idle: 52 fps → 59 with lagoon hidden → 60 no-anim. The static lagoon backdrop wasn't layer-promoted, so it repainted every frame the nodes animate above it. Promoted it to its own GPU layer (idle 52 → 57-58, verified) and removed ~125 lines of dead caustic/shimmer CSS that animated nothing. Gate 5/5.
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