Add grouping by package type in list command

[thelovekesh]

• Add grouping by package type

$ wpm ls
cli
├── plugin
│   ├── auto-cloudinary@1.3.1
│   ├── better-search-replace@1.4.10
│   ├── dinopack-for-elementor@1.0.8
│   │   └── elementor@4.1.1
│   ├── duplicate-post@4.6.0
│   ├── pantheon-advanced-page-cache@2.1.2
│   ├── redirection@5.7.5
│   ├── solr-power@2.6.0
│   ├── wordpress-seo@27.7.0
│   └── wp-redis@1.4.7
└── theme
    ├── astra@4.13.4
    └── twentytwentyfive@1.5.0

• Add theme|plugin arg to list deps for a particular package type

$ wpm ls plugin
cli
└── plugin
    ├── auto-cloudinary@1.3.1
    ├── better-search-replace@1.4.10
    ├── dinopack-for-elementor@1.0.8
    │   └── elementor@4.1.1
    ├── duplicate-post@4.6.0
    ├── pantheon-advanced-page-cache@2.1.2
    ├── redirection@5.7.5
    ├── solr-power@2.6.0
    ├── wordpress-seo@27.7.0
    └── wp-redis@1.4.7

[github-actions]

📦 wpm cli builds 📦

• darwin/amd64 - build
• darwin/arm64 - build
• linux/amd64 - build
• linux/arm/v6 - build
• linux/arm/v7 - build
• linux/arm64 - build
• linux/ppc64le - build
• linux/riscv64 - build
• linux/s390x - build
• windows/amd64 - build
• windows/arm64 - build

[gemini-code-assist]

Code Review

This pull request updates the 'wpm ls' command to group direct dependencies by their package type (such as 'plugin', 'theme', or 'unknown'), adds support for filtering by type, introduces command aliases, and optimizes output rendering using a buffered writer. The review feedback correctly points out that manual edits were made inside the auto-generated marker block in 'docs/reference/cli/ls.md', which violates the project guidelines in 'CLAUDE.md' and will be overwritten by the documentation generator.

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[thelovekesh]

cc @ryanwelcher