fix(examples): disable SSGINode temporal filtering under FSR3

[DennisSmolek]

Problem

The SSGI examples (06, 09) show ghost streaks trailing off moving silhouettes — reported against the deployed gallery and reproduced headlessly on GPU at both render scale 1 and 2. The streaks are gated on SSGI being enabled.

Root cause

three's SSGINode.useTemporalFiltering defaults to true: it rotates the GI sampling pattern on a 6-frame cycle, and its own doc comment states that mode "requires the usage of TRAANode". Our examples deliberately have no TRAA — FSR3 is the temporal resolver — but FSR3 does not satisfy that contract: the per-frame GI swing inflates the variance-clip AABB exactly where GI gradients are strong (silhouette edges), so stale history survives the clip and streaks out of moving edges.

Fix

Set useTemporalFiltering = false in both examples — three's documented recipe for the no-TRAA case (static pattern + DenoiseNode, which both examples already run) — and correct the example header comments that claimed FSR3 resolves the rotation. CLAUDE.md gains the landmine note so this doesn't regress.

Verification (headless Chrome + CDP, Apple Metal)

• A/B with filtering on vs off at render scale 1, SSGI-only, orbiting camera: streak bands + edge fringes with filtering on; clean with it off.
• Post-fix: example 09 at ratio 2 with SSGI+SSR on, and example 06 switched to SSGI — clean silhouettes under motion. Trade is the documented one: static GI noise pattern visible as faint crosshatch under fast motion, converged by FSR3 when motion slows.
• lint / typecheck pass; changes are examples + docs only.

Note: the fix: type will auto-publish a patch release on merge even though the npm package content is unchanged (examples aren't packaged) — flagged in review discussion, accepted.

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