feat: persistent top-center title + "by Noah Federovitch" credit - #16

What

User-directed polish (not a milestone): surface the Live Depth Field name from the boot loader onto the running app — persistently at the top-middle of the screen — and add the author credit by Noah Federovitch beneath it.

How

Both are static presentational chrome:

• index.html — an inline #app-title overlay (name + credit), like #boot-loader, so it's in the page from the first paint and testable in the raw server bytes.
• src/style.css — styled to mirror the boot loader's phosphor-green .boot-title (uppercase name in --accent with a green glow, dimmer --accent-dim credit line, monospace). pointer-events: none so it never intercepts orbit drags on the canvas; z-index: 5 (below the loader's 10) so the loader still fully covers it during boot.
• No JS. src/main.js, the render loop, OrbitControls, the geometry/shader, and the M4 decoupling machinery are byte-unchanged.

Test

New smoke test (tests/smoke.spec.js) asserts:

• both strings ship in the raw server HTML (not JS-injected);
• the live title is visible, horizontally centered near the top (center within 40px of viewport center, top < 80px);
• the overlay does not capture pointer events over the canvas (elementFromPoint at its center returns the canvas).

Proven non-tautological: RED on the prior HTML (no #app-title), green only with the change.

Verification

• Full local suite green (all 16 tests pass individually; the M4 webcam churn tests remain timing-flaky under 2-worker software WebGL — reproduced on the untouched baseline, unrelated to this HTML/CSS change).
• Independent adversarial verifier (read-only, did not see the implementation reasoning): verdict SOUND — confirmed pointer-events pass-through, correct z-order, safe boot-loader race, non-tautological test, no build/render/existing-test breakage.
• Review: inline (project's /code-review launches a billed cloud Workflow the user didn't opt into) — no unresolved or judgment-call findings.
• Verified visually on a real production build: centered green title + credit above the orbiting cloud (~21fps).

Rollback

Pre-change HEAD: d5546e8.

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