feat: Create zarr-data-format plugin scaffold

[cdcore09]

Description

Create the initial plugin directory structure and metadata for the zarr-data-format plugin. This is a comprehensive, general-purpose plugin for working with the Zarr array storage format across the full ecosystem.

Research Reference

Full research document: .agents/research-zarr-chunk-optimization-and-zarr-plugin.md

Acceptance Criteria

• Create plugins/zarr-data-format/.claude-plugin/plugin.json with:

  {
    "name": "zarr-data-format",
    "description": "Comprehensive agents and skills for working with the Zarr array storage format",
    "version": "0.1.0",
    "author": {
      "name": "SSEC Research Team",
      "url": "https://github.com/uw-ssec"
    }
  }

• Create empty directories:
  • agents/
  • skills/zarr-fundamentals/
  • skills/compression-codecs/
  • skills/cloud-storage-backends/
  • skills/zarr-xarray-integration/
  • skills/data-migration/
• Create LICENSE (BSD-3-Clause, symlink to root)
• Add plugin entry to .claude-plugin/marketplace.json:

  {
    "name": "zarr-data-format",
    "source": "./plugins/zarr-data-format",
    "description": "Comprehensive agents and skills for working with the Zarr array storage format",
    "homepage": "https://github.com/uw-ssec/rse-plugins",
    "repository": "https://github.com/uw-ssec/rse-plugins",
    "license": "BSD-3-Clause",
    "keywords": ["zarr", "array-storage", "cloud-native", "compression", "xarray", "dask", "hdf5", "netcdf", "scientific-computing", "data-format"],
    "category": "data-science",
    "strict": false
  }

• Create README.md documenting the plugin structure, available agents/skills, and usage (follow pattern from plugins/scientific-domain-applications/README.md)

Plugin Architecture

zarr-data-format/
├── .claude-plugin/
│   └── plugin.json
├── agents/
│   ├── zarr-expert.md                     # Primary Zarr expert agent
│   └── zarr-cloud-architect.md            # Cloud storage + Zarr integration specialist
├── skills/
│   ├── zarr-fundamentals/
│   │   ├── SKILL.md
│   │   ├── assets/
│   │   │   └── zarr-quickstart.py
│   │   └── references/
│   │       ├── PATTERNS.md
│   │       ├── EXAMPLES.md
│   │       └── COMMON_ISSUES.md
│   ├── compression-codecs/
│   │   ├── SKILL.md
│   │   ├── assets/
│   │   │   └── codec-comparison.py
│   │   └── references/
│   │       ├── PATTERNS.md
│   │       ├── EXAMPLES.md
│   │       └── COMMON_ISSUES.md
│   ├── cloud-storage-backends/
│   │   ├── SKILL.md
│   │   ├── assets/
│   │   │   ├── s3-config-template.py
│   │   │   ├── gcs-config-template.py
│   │   │   └── azure-config-template.py
│   │   └── references/
│   │       ├── PATTERNS.md
│   │       ├── EXAMPLES.md
│   │       └── COMMON_ISSUES.md
│   ├── zarr-xarray-integration/
│   │   ├── SKILL.md
│   │   └── references/
│   │       ├── PATTERNS.md
│   │       ├── EXAMPLES.md
│   │       └── COMMON_ISSUES.md
│   └── data-migration/
│       ├── SKILL.md
│       ├── assets/
│       │   └── migration-template.py
│       └── references/
│           ├── PATTERNS.md
│           ├── EXAMPLES.md
│           └── COMMON_ISSUES.md
├── README.md
└── LICENSE

Integration Notes

• The existing scientific-domain-applications plugin has an xarray-for-multidimensional-data skill that covers xarray basics. This plugin extends that with Zarr-specific depth. Cross-references should link between the two.
• The zarr-chunk-optimization plugin (feat: Create zarr-chunk-optimization plugin scaffold #61) focuses on performance optimization. This plugin covers general Zarr operations. Some overlap in cloud storage content is expected — this plugin is the comprehensive reference, the optimization plugin cross-references it.

Context

This is the first of 8 issues for the zarr-data-format plugin. This scaffold issue should be completed first as all other issues depend on the directory structure being in place.