[todie]

Adds the bench.cerebral.work benchmark observatory and its /visualizations/ lab to the established benchmark repo. The site follows the extracted cerebral.work V2 paper-and-ink design, with accessible filters, theme controls, result tables, and downloadable evidence. The legacy bench.unsigned.gg target keeps its existing assets and configuration.

The observatory presents a bounded Scorcher local capture, Saga virtual-clock simulations and evaluation-fixture controls. Cortex has inspected protocol coverage and explicitly pending execution results. Units, sample counts, capture conditions and source fingerprints accompany each result; no universal score or unattested production performance is claimed.

The visualization lab adapts all 174 entries / 14 categories of the pinned D3 gallery revision 1120. Three.js owns graphics; compiled Rust/WASM handles sampling, rolling statistics, histograms, quantiles, density, force steps, selection and model integration. D3 math/layout helpers remain JavaScript. The catalog has original-author links, local raster/vector maps, actual GeoTIFF decoding, searchable/deep-linkable state, touch/keyboard controls, camera/brush/hierarchy interactions, data downloads and opt-in animation. Values are labeled demonstrations rather than the source notebooks’ historical data or benchmark measurements. This is a local concept collection, not pixel-identical notebook copies or a port of the separate Plot gallery.

Implements spec 0001 and spec 0002. Review guides: docs/bench-cerebral-work.md, docs/visualization-gallery.md, and dated QA records under docs/qa/.

Validation:

• 24 Node tests and 3 native Rust tests pass, including evidence-integrity negative controls and real compiled-WASM numeric checks.
• Every one of the 174 gallery entries produces finite GPU geometry and nonempty pixels in Chrome software WebGL. This verifies correctness, not GPU performance.
• Zero axe violations or document overflow at 320/390/768/1440 widths in light/dark themes; keyboard, deep links, hierarchy, brushing, zoom, quaternion dragging, bounding-box focus, stacked/grouped interpolation, CSV, motion and renderer-failure controls pass.
• The original homepage browser regression passes, including actual p99 values, Saga fixtures, filters, downloads, narrow widths and no-JavaScript evidence.
• Both Cerebral and legacy Worker dry-runs pass. Browser coverage/screenshots and the static review artifact are retained by the PR workflow. Third-party licenses are packaged; personal compiler paths are remapped out of the public WASM.

Release boundary: signed topic commits only. No merge, live deployment or DNS change. A separate wrangler.cerebral.jsonc describes the proposed Cerebral hostname; publishing it remains operator-gated.