v3.5.1

Mostly a patch release for #1735.

Bug Fixes

• fix camera radius reset by @elalish in #1733.
• Fix &v[size] UB in normals test sentinel pointers by @zmerlynn in #1736.
• Fix originalID races on shared CSG nodes by @zmerlynn in #1741.

Bindings

• Expose ExecutionContext factories in bindings (C/Python/WASM) by @zmerlynn in #1743.

Refactoring

• Thread ExecutionContext into MeshGL ingest via ExecutionContext::FromMeshGL by @zmerlynn in #1723.
• Thread ExecutionContext into Smooth via ExecutionContext::Smooth by @zmerlynn in #1734.
• Thread ExecutionContext into LevelSet via ExecutionContext::LevelSet by @zmerlynn in #1739.
• Per-phase timing in ADVANCE_PHASE_OR_RETURN; extend perfPhases by @zmerlynn in #1742.
• Route Boolean3::Result timing through the shared phase mechanism by @zmerlynn in #1745.