docs(mcp): add opencode-specific config example

Dmitry Gruzdrequested to merge
fix/mcp-docs-opencode-config into main

Problem

The MCP setup docs at docs/source/remote/access/mcp.md only show the Claude Code/Desktop config format (command as string + separate args array). opencode uses a different schema that requires "type": "local" and places command and arguments in a single array.

Users following the current docs for opencode get ConfigInvalidError because of three schema mismatches:

  1. Missing required "type": "local" — opencode's McpLocalConfig schema has "required": ["type", "command"]
  2. command must be an array, not a string — opencode expects ["npx", "mcp-remote", "..."]
  3. No args field exists in opencode's schema — both local and remote config types have "additionalProperties": false

Reported by @thiagocsf in gitlab-org#21994 (comment 3342544059)

Solution

Add an opencode-specific config example alongside the existing Claude snippet, with a note explaining the differences.

The existing Claude Code/Cursor/Codex snippet is unchanged.

Closes https://gitlab.com/dgruzd/tasks/-/work_items/2649

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