feat(capture): render generated scene layer

[johnathanchiu]

Generated scenes from Capture now render as an independent layer through the viewer's existing model renderer. The original photographic mesh remains independently selectable, and pending or failed generated output is not treated as a ready model.

The contribution is reconciled with current main, including capture viewer isolation and snapshot atmosphere changes. It preserves the original contribution commits and adds schema and rendering regressions.

Validation: 2,842 core tests and 351 viewer tests pass; the combined private workspace typecheck and full production build pass. Public package architecture review confirms that schema identity remains in core and rendering remains in viewer.

The private integration is tracked in pascalorg/private-editor#673. Production Monoform execution stays disabled until its credentials, tenant isolation and complete worker contract are verified.

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Note

Low Risk
Additive capture stream mapping and viewer routing that reuses existing model artifact checks and availability gating; no auth or data-path changes.

Overview
Adds first-class support for spaceform-scene capture streams as a separate viewer layer (spaceformScene), distinct from the photographic room-model layer (model).

Core maps kind: 'spaceform-scene' in captureLayerKey so manifests can carry both streams without colliding. Viewer treats spaceformScene like a model stream for renderability (valid GLB/USDZ artifact, not pending/failed) and routes it through the existing CaptureRoomModel path.

Regression tests lock in independent layer keys and that generated output only renders when availability is ready with a supported model artifact.

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[pascal]

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