feat: ink render mode, contour effects, and the loaders gallery

[apresmoi]

Adds the ink render mode, three new character encodings, hidden-line removal, and a font-weight shading axis to the rasterizer; extends field-synth with iso-contour output, categorical argmax combining, and per-voice placement; and adds /examples/loaders, a gallery of ASCII loaders built from stock effects.

Rasterizer

• mode: "ink" — silhouette + crease outlines traced with oriented glyphs, with hidden-line removal that exempts each edge's own vertex neighbourhood so a mesh never self-occludes its outline.
• charMode: "braille" | "halfblock" | "quadrant" — sub-cell dot coverage, and two-colour-per-cell encodings that trade glyph shape for colour resolution.
• hiddenLines: "hide" for wireframe and ink; wireframeJunctions for box-drawing joints.
• solidWeightRamp — CSS font-weight as a second density axis, calibrated against measured ink coverage.

Effects

• subcellRes: "ink" contours the field at inkLevels cuts through the amplitude axis, oriented to the local gradient. Lines only — plateaus stay empty.
• combine: "argmax" is categorical rather than value-folding: it reports which voice won, so regions get one flat level. This is what makes hard-edged tilings expressible.
• Per-voice angleN and originUN/originVN — steerable plane waves and independent field centres.
• New presets: Cube tiles, Ink cells.

Website

• /examples/loaders — 27 loaders (indeterminate and determinate) shown at nine box sizes each, with per-example code export in HTML/JS/React/Vue.
• /synth split into a reusable kit so both pages share the voice cards and dock.

Fixes found while documenting

Four bugs surfaced from auditing the docs against the code:

• Vue <GlyphScene> was missing smoothShading/creaseAngle, and Vue had no useGlyphMesh composable — both mirroring violations.
• directional-direction was in the custom element's observed attributes but never read, so HTML could not set light direction at all.
• Per-voice origin was applied in unscaled units, so its effect changed with scale.

Docs

Four audit passes against the real API. The guides described the predecessor's architecture — a pre-baked frame strip animated with CSS steps() — across eight files; that is now the actual render model. Two code samples imported a package name that does not exist and called a fabricated signature. Roughly forty further corrections, plus previously undocumented surfaces: scene options, every stock effect's parameters, custom-element attributes, compile options, and the static effect export.

Breaking

• UseGlyphAnimationResultVue renamed to UseGlyphAnimationResult to match React. No shim, per the repo's no-BC rule.

Verification

pnpm test (7 packages) and pnpm build green. Browser-verified on /synth, /gallery, /wordart and /examples/loaders.