Add the Roblin demo, and give the provenance line real badges

[hoainho]

Adds Roblin, a rigged goblin skirmisher, and gives the demo panel's provenance line real badges.

The demo

A character rebuilt as ONE measured skinned shell — 113,338 triangles, 41 real bones, 16 embedded clips, nothing fetched at runtime. The playground measured the surface and the rig; everything on top of that is authored here:

• 10 sockets derived from the real bones. The export shipped no actionProfile at all, so each socket is (real bone) + (multiple of a measured body length, along a measured body axis). No literal world coordinate appears in the effect code.
• A clip controller with cross-fades, one-shots that return, and cues read off the mixer's own clock rather than a wall-clock timer.
• Three skills and a sprint, all aimed down the limb's own measured axis — verified at the call site as 0.0° from the hand's aim while sitting 9–16° off the torso.
• A hand-written effect layer in plain three: instanced-quad particles with velocity-stretched streaks and an alpha-blended matter layer, ribbon trails, a procedural fracture, a bubbling caustic pool, a gnat swarm. No new dependency, no textures, no fetches.
• A light rig whose every colour is measured — from the reference photo and from the model's own 62,956 vertex colours — then boosted, with each derivation recorded in code.

Gate R1

A clip that exists is not a clip that runs. Each of the 16 clips is seeked to 7 points and the skin is measured through applyBoneTransform against the true bind pose:

maxSampledBindingDelta = 2.832009 world units (188.5% of figure height)
16 pass, 0 fail, 0 unevaluated

Deltas over 100% are expected — the rig binds in a T-pose. The column that separates a running clip from a parked one is maxInterSampleDelta, reported per clip. Nothing is unevaluated, and there is no default-pass branch in the probe.

The write-up, including the defects that only measuring found, is in docs/showcases/roblin-stage-r.md.

The badge change (touches every demo)

src/pages/demo.ts has emitted .badge spans since the panel was written, but no CSS for that class ever existed — so every demo rendered its subject class, its provenance and its status as one run-on sentence of inline text.

• generatedWith is authored as middot-separated steps and was rendered as a single badge; it is now split into one badge per step. No authored string changes.
• .badge gets its first rules, built from the tokens already in styles.css: .btn's surface, border and 4px radius at a smaller size, in the mono face the site reserves for machine facts. The accent stays scarce as the palette note asks — amber fills a final status and nothing else; placeholder recedes behind a dashed rule.

One subtlety worth flagging for review: the chip is inline-block, not inline-flex. brand() wraps the product name in its own span, and inside a flex container the text following that span becomes a separate anonymous flex item whose leading whitespace is stripped — "img2threejs playground" rendered as one word.

Checks

• tsc --noEmit clean, npm run build clean
• npm run gate:r1 in the standalone package exits 0 (16/16)
• Verified in the browser: Roblin renders and casts in the gallery; badges checked on both a character/placeholder demo and an object/final one

Known limits

Recorded in object-sculpt-spec.json under qualityContract.notDone, in short: no AI-vision fidelity review has been run; the single part label is still a bounds hypothesis (the bone names are not); the sprint's ground speed is authored because all 16 clips are in-place; and preset:biped:fire is a static aiming pose with no strike in it, which is why the casts sit on box_02/box_03.