zarr metadata 0.3.0 (#4084)

* chore(deps): bump the actions group across 1 directory with 8 updates (#176)

Bumps the actions group with 8 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [prefix-dev/setup-pixi](https://github.com/prefix-dev/setup-pixi) | `0.9.5` | `0.9.6` |
| [codecov/codecov-action](https://github.com/codecov/codecov-action) | `6.0.0` | `6.0.1` |
| [github/issue-metrics](https://github.com/github/issue-metrics) | `4.2.2` | `4.2.7` |
| [j178/prek-action](https://github.com/j178/prek-action) | `2.0.3` | `2.0.4` |
| [actions/upload-artifact](https://github.com/actions/upload-artifact) | `7.0.0` | `7.0.1` |
| [actions/download-artifact](https://github.com/actions/download-artifact) | `7.0.0` | `8.0.1` |
| [pypa/gh-action-pypi-publish](https://github.com/pypa/gh-action-pypi-publish) | `1.13.0` | `1.14.0` |
| [zizmorcore/zizmor-action](https://github.com/zizmorcore/zizmor-action) | `0.5.3` | `0.5.6` |



Updates `prefix-dev/setup-pixi` from 0.9.5 to 0.9.6
- [Release notes](https://github.com/prefix-dev/setup-pixi/releases)
- [Commits](prefix-dev/setup-pixi@1b2de7f...5185adf)

Updates `codecov/codecov-action` from 6.0.0 to 6.0.1
- [Release notes](https://github.com/codecov/codecov-action/releases)
- [Changelog](https://github.com/codecov/codecov-action/blob/main/CHANGELOG.md)
- [Commits](codecov/codecov-action@57e3a13...e79a696)

Updates `github/issue-metrics` from 4.2.2 to 4.2.7
- [Release notes](https://github.com/github/issue-metrics/releases)
- [Commits](github-community-projects/issue-metrics@c9e9838...1e38d5e)

Updates `j178/prek-action` from 2.0.3 to 2.0.4
- [Release notes](https://github.com/j178/prek-action/releases)
- [Commits](j178/prek-action@6ad8027...bdca6f1)

Updates `actions/upload-artifact` from 7.0.0 to 7.0.1
- [Release notes](https://github.com/actions/upload-artifact/releases)
- [Commits](actions/upload-artifact@v7...043fb46)

Updates `actions/download-artifact` from 7.0.0 to 8.0.1
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v7...3e5f45b)

Updates `pypa/gh-action-pypi-publish` from 1.13.0 to 1.14.0
- [Release notes](https://github.com/pypa/gh-action-pypi-publish/releases)
- [Commits](pypa/gh-action-pypi-publish@v1.13.0...cef2210)

Updates `zizmorcore/zizmor-action` from 0.5.3 to 0.5.6
- [Release notes](https://github.com/zizmorcore/zizmor-action/releases)
- [Commits](zizmorcore/zizmor-action@b1d7e1f...5f14fd0)

---
updated-dependencies:
- dependency-name: prefix-dev/setup-pixi
  dependency-version: 0.9.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
- dependency-name: codecov/codecov-action
  dependency-version: 6.0.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
- dependency-name: github/issue-metrics
  dependency-version: 4.2.7
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
- dependency-name: j178/prek-action
  dependency-version: 2.0.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
- dependency-name: actions/upload-artifact
  dependency-version: 7.0.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
- dependency-name: actions/download-artifact
  dependency-version: 8.0.1
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: actions
- dependency-name: pypa/gh-action-pypi-publish
  dependency-version: 1.14.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
- dependency-name: zizmorcore/zizmor-action
  dependency-version: 0.5.6
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: actions
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore(zarr-metadata): render 0.3.0 changelog

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 3 people

packages/zarr-metadata/CHANGELOG.md

@@ -2,6 +2,34 @@
 
 <!-- towncrier release notes start -->
 
+## 0.3.0 (2026-06-19)
+
+### Deprecations and Removals
+
+- Introduces a new `JSONValue` type that models python objects that serialize directly to JSON. This type is used to annotate the contents of `attributes` and `fill_value` fields, replacing the use of the overly wide `object` type. This is technically a breaking change. ([#4037](https://github.com/zarr-developers/zarr-python/issues/4037))
+- Promoted a curated "front door" of names to the top-level `zarr_metadata`
+  namespace, so consumers can write e.g. `from zarr_metadata import
+  ArrayMetadataV3, ShardingIndexLocation, BLOSC_CNAME` instead of importing from
+  deep submodule paths. The front door covers every metadata-document TypedDict,
+  each codec/chunk-grid/chunk-key-encoding canonical type, the full data-type
+  trio for every dtype, and every constant + `Literal` pair. Deep submodule paths
+  continue to work unchanged.
+
+  Several promoted names were given clearer, less ambiguous spellings than their
+  deep-module names, since they now appear bare at the top level:
+  `Endian`/`ENDIAN` → `Endianness`/`ENDIANNESS`,
+  `IndexLocation`/`INDEX_LOCATION` → `ShardingIndexLocation`/`SHARDING_INDEX_LOCATION`,
+  `RoundingMode`/`ROUNDING_MODE` → `CastRoundingMode`/`CAST_ROUNDING_MODE`,
+  `OutOfRangeMode`/`OUT_OF_RANGE_MODE` → `CastOutOfRangeMode`/`CAST_OUT_OF_RANGE_MODE`,
+  `DateTimeUnit` → `NumpyTimeUnit`,
+  `NamedConfig` → `NamedConfigV3`, and
+  `MetadataFieldV3` → `MetadataV3` (matching the name `zarrs` uses for this
+  `name`-or-`{name, configuration}` shape).
+
+  Also added the `NUMPY_TIME_UNIT` runtime constant (a `Final` tuple paired with
+  the `NumpyTimeUnit` Literal) in `zarr_metadata.v3.data_type.numpy_timedelta64`. ([#4083](https://github.com/zarr-developers/zarr-python/issues/4083))
+
+
 ## 0.2.0 (2026-05-19)
 
 ### Bugfixes