Document provider-managed remote MCP support

[evalstate]

Summary

This PR documents provider-managed remote MCP support in fast-agent.

What changed

• Added provider-managed remote MCP docs to config reference
• Added AgentCard / ToolCard mcp_connect examples for provider-managed remote MCP
• Added MCP guide coverage for provider-managed remote MCP and its filtering rules
• Added provider support notes to the Anthropic and Responses provider pages

Documented behavior

Provider-managed remote MCP uses:

• management: provider
• remote URL servers only (http / sse)
• access_token for bearer auth
• optional description
• optional defer_loading for Responses-family providers

Support matrix

Documented as supported only for:

• anthropic
• responses
• codexresponses

Documented as not supported for:

• anthropic-vertex
• openai
• openresponses
• other providers

Constraints documented from code

• provider-managed servers must be remote URL servers
• url is required
• do not use headers / auth / local-process settings for provider-managed servers
• tool filtering must use exact tool names
• wildcard tool filters are not supported
• prompt/resource filters are not supported

Files updated

• docs/ref/config_file.md
• docs/ref/agent_cards.md
• docs/mcp/index.md
• docs/models/llm_providers.md

Validation

• Built docs successfully with:
  • uv run mkdocs build -q

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