Support MCP Sampling in Copilot CLI

[ibnelwalid]

Describe the feature or problem you'd like to solve

MCP Sampling is supported in Github copilot chat, but not supported in Copilot CLI

Proposed solution

Allow MCP servers that use sampling to run in Copilot CLI

Example prompts or workflows

Any MCP server that calls ctx.sample_step says sample_step isn't supported

Additional context

No response