Support MCP server prompts

[sperry]

Describe the feature or problem you'd like to solve

Provide client side support for MCP server prompts

Proposed solution

Similar to VS Code, allow MCP server prompts to be loaded (e.g. /mcp..)
Prompts should allow for inputs

Example prompts or workflows

No response

Additional context

No response

[echarrod]

➕ I did run copilot expecting the same MCP servers I've configured in my project at .vscode/mcp.json would be loaded

[echarrod]

Ah is this a duplicate of #146?

[sperry]

@echarrod - What I'm asking for is for Copilot CLI to support MCP prompts (and ideally the full MCP specification)

[EvanBoyle]

cc @ellismg who is working on MCP completeness