version 0.3.0

[eagmon]

Release 0.3.0. Minor bump for the map-reduce engine feature plus the zarr-3.3 support and metadata-emission fixes merged since 0.2.3:

• Default transducer.buffer.size to 600; port upstream resource-param docs #29 buffer.size optional, default 600 + resource-parameter docs
• Correct metadata emission for generation > 1 and appending buffers #30 metadata-emission fixes (generation > 1 chunking; child-var unit attrs)
• Allow zarr 3.3; strictly exclude root node from consolidated metadata #31 allow zarr 3.3 + strictly exclude root node from consolidated metadata
• Port the out-of-core zarr map-reduce engine #32 out-of-core zarr map-reduce engine (mapreduce/zarr_mapreduce/zarr_utils)
• Re-lock uv.lock for bottleneck + fsspec #33 lock fixup (bottleneck/fsspec)

Merging this, then tagging v0.3.0, triggers release.yml to publish to PyPI (OIDC). Enables downstream (v2ecoli) to depend on the engine via viva-emitters>=0.3.0.

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