chore: green up tsc --noEmit on main

[aka-blackboots]

Summary

Brings npx tsc --noEmit to a clean exit (was exiting with code 2 and 122 lines of errors). Prerequisite for adding a CI workflow that enforces typecheck on every PR.

What changed

Change	Why
tsconfig.json — add exclude for src/.../elements/catalog/	Those files reference non-existent ../shared/dual-view / ../shared/geometry modules (~115 TS errors). The dir's index.ts already has every export * commented out, so the files are not part of any build output. Full deletion of the directory deferred to a later PR.
Delete src/.../solids/wall-component/wall-engine.ts (and the now-empty wall-component/ dir)	Orphan: zero importers anywhere in src/ or examples/, and method bodies are stubs (no real logic).
ViewportBlock — drop implements IShape clause and unused IShape import	The class declared the contract but did not honor it (missing subElements2D / subElements3D). Declaration was misleading; the runtime behavior is unchanged.
single-wall.ts and poly-wall.ts — remove transparent: false and opacity: 1 from the options bag passed to solid.subtract()	opengeometry@2.0.9's BooleanExecutionOptions only accepts color, outline, fatOutlines, outlineWidth, kernel. Removed fields match kernel defaults; no behavioral change.

Verification

• npx tsc --noEmit — exits 0 (was 2, 122 lines of errors)
• npm run build — green, created dist/ in ~1.1s
• Reviewer-side: load a few examples to confirm no rendering regression on walls (single-wall.html, polyline-wall.html, wall-opening.html)

Notes

• This PR does not add CI yet — that's the next PR. This one just makes tsc pass on main.
• Catalog directory remains physically present for now; only excluded from typecheck. A later PR will decide its fate (implement vs delete).

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