[plan] Document registry field in user-facing documentation

[github-actions]

Objective

Add documentation for the registry MCP property in user-facing guides.

Context

From discussion #11706: The registry field is implemented (pkg/parser/mcp.go:86), tested (mcp_config_compilation_test.go), and compiled correctly, but has NO end-user documentation. Users need to know this field exists and how to use it.

Approach

Add documentation for the registry field to relevant docs:

1. docs/reference/tools.md - Add to MCP configuration reference
2. docs/reference/mcp-gateway.md - Include in MCP server setup examples

Include:

• Field purpose: URI to installation location from MCP registry
• Example usage: registry: "https://api.mcp.github.com/v0/servers/microsoft/markitdown"
• When to use vs other installation methods

Files to Modify

• docs/reference/tools.md - Add registry field documentation
• docs/reference/mcp-gateway.md - Add registry examples

Acceptance Criteria

• registry field documented in tools.md reference
• Example usage included in mcp-gateway.md
• Clear explanation of when to use registry vs other methods
• Consistent with existing documentation style
• Examples tested to ensure correctness

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[github-actions]

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