Update Context7 plugin for v2 API

- Update skill/agent/command to use new query-docs tool (replaces get-library-docs)
- Add query parameter usage for intelligent reranking
- Add version pinning support (e.g., /vercel/next.js/v15.1.8)
- Add tools and model metadata to agent
- Simplify docs to focus on workflow, not parameter details
- Add README.md with usage examples

external_plugins/context7/README.md

@@ -0,0 +1,119 @@
+# Context7 Plugin
+
+Up-to-date, version-specific documentation and code examples for any library, directly in your AI coding assistant.
+
+## What is Context7?
+
+Context7 solves the problem of outdated training data and hallucinated APIs by providing real-time library documentation. Instead of relying on potentially outdated knowledge, Context7 fetches current documentation straight from source repositories.
+
+**Without Context7:**
+- Code examples based on outdated training data
+- Hallucinated APIs that don't exist
+- Generic answers for old package versions
+
+**With Context7:**
+- Current documentation from source repositories
+- Working code examples
+- Version-specific information
+- Intelligent query-based context selection
+
+## Available Tools
+
+### `resolve-library-id`
+
+Search and resolve library names to Context7-compatible library IDs.
+
+```
+Parameters:
+- libraryName: Library name to search for (e.g., "react", "next.js")
+- query: Your question for relevance ranking
+
+Returns:
+- id: Context7-compatible ID (e.g., "/vercel/next.js")
+- title: Display name
+- description: Short description
+- totalSnippets: Documentation coverage
+- benchmarkScore: Quality indicator (0-100)
+- versions: Available versions
+```
+
+### `query-docs`
+
+Fetch documentation with intelligent, query-based reranking.
+
+```
+Parameters:
+- libraryId: Context7-compatible library ID
+  - Format: /org/project (e.g., /vercel/next.js)
+  - With version: /org/project/version (e.g., /vercel/next.js/v15.1.8)
+- query: Specific question or task
+
+Features:
+- LLM-driven reranking based on query intent
+- Deduplicated snippet selection
+- Limited to 3 calls per question
+```
+
+## Usage
+
+### Automatic (Skill)
+
+The `documentation-lookup` skill triggers automatically when you:
+- Ask "how do I..." for any library
+- Need code generation with a specific library
+- Ask about setup or configuration
+- Mention any framework (React, Next.js, Vue, etc.)
+
+### Manual (Command)
+
+Use the `/context7:docs` command:
+
+```
+/context7:docs react hooks
+/context7:docs next.js how to set up authentication
+/context7:docs /vercel/next.js/v15.1.8 app router
+```
+
+### Agent
+
+Use the `docs-researcher` agent for focused documentation lookups that don't bloat the main conversation:
+
+```
+Spawn a docs-researcher agent to find React Query mutation examples
+```
+
+## Version Pinning
+
+For consistent, reproducible results, use version-specific library IDs:
+
+```
+/vercel/next.js/v15.1.8
+/facebook/react/v18.3.0
+/prisma/prisma/v5.0.0
+```
+
+## Examples
+
+**Basic usage:**
+```
+How do I set up authentication in Next.js?
+→ Automatically fetches Next.js auth documentation
+```
+
+**With specific version:**
+```
+/context7:docs /vercel/next.js/v15.1.8 middleware
+→ Fetches Next.js 15.1.8 middleware documentation
+```
+
+**Multiple libraries:**
+```
+How do I use Prisma with Next.js API routes?
+→ Fetches relevant docs from both Prisma and Next.js
+```
+
+## Links
+
+- [Context7 Website](https://context7.com)
+- [GitHub Repository](https://github.com/upstash/context7)
+- [Upstash](https://upstash.com)