feat(pixi): port idaptik-reached Pixi/UI/Sound remainder (#760)

[hyperpolymath]

Why

#760 is the remaining Pixi.res inventory beyond the #56 bar. #56 is closed. This ports only what a real IDApixiTIK build still reaches.

Audit

JoshuaJewell/IDApixiTIK src/bindings/Pixi.res (~313 decls) vs src/app + src/engine call sites.

This PR

• Graphics circle / stroke / roundRect / moveTo / lineTo / quadraticCurveTo
• Container per-axis x/y, parent Option, interactiveChildren, addChildAt, removeChildren, hitArea circle
• ObservablePoint set/get (idaptik's 36 scale.set sites)
• Texture.WHITE, ticker deltaTime, renderer.resize, Assets init/loadBundle
• FancyButton onPress/onDown/onHover, Slider value, Input value/onEnter/onChange, List.addChild
• @pixi/sound singleton (pauseAll / find / play(name) / volumeAll) — that is what PixiSound.res actually uses
• Bun-ESM lowerings + smokes

Out of scope

• Unused Pixi.res (BigPool, Extensions, ResizePlugin, CanvasStyle, TextStyle, ScrollBox, sprite atlases)
• --deno-esm (retired)
• INT-03 S6c: flip default wasm target preview1 → component + native-preview2 cleanup #486 native-preview2

Does not claim production-ready (DOC-09).

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 5204e90 and f25d74d.

📒 Files selected for processing (14)

• CHANGELOG.adoc
• docs/CAPABILITY-MATRIX.adoc
• docs/TECH-DEBT.adoc
• docs/bindings-roadmap.adoc
• lib/codegen_deno.ml
• stdlib/Pixi.affine
• stdlib/PixiSound.affine
• stdlib/PixiUI.affine
• tests/codegen-deno/pixi_smoke.affine
• tests/codegen-deno/pixi_smoke.harness.mjs
• tests/codegen-deno/pixisound_smoke.affine
• tests/codegen-deno/pixisound_smoke.harness.mjs
• tests/codegen-deno/pixiui_smoke.affine
• tests/codegen-deno/pixiui_smoke.harness.mjs

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[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud