v5.0.0-alpha.13

• feat(geoarrow): Expose materializeGeoArrowRows for runtime adapters and preserve empty points encoded with non-finite or null ordinates.

• fix(geoarrow): Rebuild empty point rows and preserve empty MultiPoint members through WKB/WKT serialization.

• perf(projection): Make the configurable and lazy engines lean by default; register regional named datums through datumCatalogs and @math.gl/projection/datums. WGS84/NAD83 remain built in; the Projection wrapper retains the full catalogue for compatibility.

• feat(curves, geometry): Add parametric curves, arc-length sampling, torus, lathe and sampled surfaces (#208, #227).

• feat(geometry-utils, spatial-index): Add mesh processing and experimental static spatial indexes (#211, #223).

• feat(geospatial, culling): Add geographic tile queries, globe occlusion, ray and closest-point queries (#198, #210, #213).

• feat(core, projection): Share local frames, add domain/factor analysis and strided bulk buffers, and expand deformation and worker qualification (#193, #195, #199, #201, #204, #205).

• fix(projection): Preserve registered datums over legacy aliases and separate reusable engines (#225, #230).

• feat(geoid): Accept decoded grids without Arrow dependencies (#235).

• feat(sun): Add altitude-aware spectral cloud lighting for dawn and dusk (#191).

• feat(examples): Add interactive module workshops, globe data exports and streaming deep-time tectonic snapshots (#194, #197, #200, #202, #203, #206, #207, #209, #212, #215, #228).

• fix(examples): Correct tectonic streaming deadlines and pose progress (#229).

• docs: Complete sun references, organize navigation and restore prerelease history (#221, #232, #234).

• build: Update dependencies and reduce CI queueing and benchmark time (#196, #214, #216, #217, #218, #219, #220, #222).