Buildkite MCP Server trims job list payloads and adds annotation summaries

The Buildkite MCP Server now returns leaner job data by default and surfaces build annotations without extra round trips. Smaller, more targeted job listings list_jobs now returns compact, actionable summaries by default, reducing token usage while keeping job IDs and failure diagnostics. Use detail_level: “detailed” for execution metadata, or detail_level: “full” for the previous, more verbose response.