feat(claude): create payload plugin (#14403)

- Adds preliminary Payload plugin for Claude Code (**beta**)
- Provides comprehensive Payload 3.x development guidance (collections,
fields, hooks, access control, queries, adapters, plugins)
- Auto-activates when working with `payload.config.ts` or collection
configs
  - Installable via `/plugin install github:payloadcms/payload`
  - Includes plugin development reference documentation

Author: denolfe

.claude-plugin/README.md

@@ -0,0 +1,67 @@
+# Payload Skill for Claude Code
+
+Claude Code skill providing comprehensive guidance for Payload 3.x development with TypeScript patterns, field configurations, hooks, access control, and API examples.
+
+## Installation
+
+### From GitHub
+
+Install this skill directly from the Payload repository:
+
+```bash
+/plugin install github:payloadcms/payload
+```
+
+## What's Included
+
+The `payload` skill provides expert guidance on:
+
+- **Collections**: Auth, uploads, drafts, live preview configurations
+- **Fields**: All field types including relationships, arrays, blocks, joins, virtual fields
+- **Hooks**: beforeChange, afterChange, beforeValidate, field hooks
+- **Access Control**: Collection, field, and global access patterns including RBAC and multi-tenant
+- **Queries**: Local API, REST, and GraphQL with complex operators
+- **Database Adapters**: MongoDB, Postgres, SQLite configurations and transactions
+- **Advanced Features**: Jobs queue, custom endpoints, localization, plugins
+
+## Usage
+
+Once installed, Claude will automatically invoke the skill when you're working on Payload CMS projects. The skill activates when you:
+
+- Edit `payload.config.ts` files
+- Work with collection or global configurations
+- Ask about Payload-specific patterns
+- Need guidance on fields, hooks, or access control
+
+You can also explicitly invoke it:
+
+```
+@payload how do I implement row-level access control?
+```
+
+## Documentation Structure
+
+```
+skills/payload/
+├── SKILL.md                              # Main skill file with quick reference
+└── reference/
+    ├── FIELDS.md                         # All field types and configurations
+    ├── COLLECTIONS.md                    # Collection patterns
+    ├── HOOKS.md                          # Hook patterns and examples
+    ├── ACCESS-CONTROL.md                 # Basic access control
+    ├── ACCESS-CONTROL-ADVANCED.md        # Advanced access patterns
+    ├── QUERIES.md                        # Query patterns and APIs
+    ├── ADAPTERS.md                       # Database and storage adapters
+    └── ADVANCED.md                       # Jobs, endpoints, localization
+```
+
+## Resources
+
+- [Payload Documentation](https://payloadcms.com/docs)
+- [GitHub Repository](https://github.com/payloadcms/payload)
+- [Examples](https://github.com/payloadcms/payload/tree/main/examples)
+- [Templates](https://github.com/payloadcms/payload/tree/main/templates)
+
+## License
+
+MIT

.claude/skills/payload-cms/SKILL.md renamed to .claude-plugin/commands/payload/SKILL.md

@@ -1,5 +1,5 @@
 ---
-name: payload-cms
+name: payload
 description: Use when working with Payload CMS projects, payload.config.ts, collections, fields, hooks, access control, or Payload API. Provides TypeScript patterns and examples for Payload 3.x development.
 ---
 
@@ -27,6 +27,10 @@ Payload 3.x is a Next.js native CMS with TypeScript-first architecture, providin
 | Custom API routes        | Collection/root endpoints                 | [ADVANCED.md#custom-endpoints](reference/ADVANCED.md#custom-endpoints)                                                           |
 | Cloud storage            | Storage adapter plugins                   | [ADAPTERS.md#storage-adapters](reference/ADAPTERS.md#storage-adapters)                                                           |
 | Multi-language           | `localization` config + `localized: true` | [ADVANCED.md#localization](reference/ADVANCED.md#localization)                                                                   |
+| Create plugin            | `(options) => (config) => Config`         | [PLUGIN-DEVELOPMENT.md#plugin-architecture](reference/PLUGIN-DEVELOPMENT.md#plugin-architecture)                                 |
+| Plugin package setup     | Package structure with SWC                | [PLUGIN-DEVELOPMENT.md#plugin-package-structure](reference/PLUGIN-DEVELOPMENT.md#plugin-package-structure)                       |
+| Add fields to collection | Map collections, spread fields            | [PLUGIN-DEVELOPMENT.md#adding-fields-to-collections](reference/PLUGIN-DEVELOPMENT.md#adding-fields-to-collections)               |
+| Plugin hooks             | Preserve existing hooks in array          | [PLUGIN-DEVELOPMENT.md#adding-hooks](reference/PLUGIN-DEVELOPMENT.md#adding-hooks)                                               |
 
 ## Quick Start
 
@@ -199,6 +203,7 @@ import type { Post, User } from '@/payload-types'
 - **[QUERIES.md](reference/QUERIES.md)** - Query operators, Local/REST/GraphQL APIs
 - **[ADAPTERS.md](reference/ADAPTERS.md)** - Database, storage, email adapters, transactions
 - **[ADVANCED.md](reference/ADVANCED.md)** - Authentication, jobs, endpoints, components, plugins, localization
+- **[PLUGIN-DEVELOPMENT.md](reference/PLUGIN-DEVELOPMENT.md)** - Plugin architecture, monorepo structure, patterns, best practices
 
 ## Resources