## Why
MCP checks recommended setting missing environment variables even when the problem was an invalid server configuration or an unreachable URL.
## What changed
Separate configuration errors from missing environment variables and build remediation guidance from all detected issue types. Include server reachability advice for failed HTTP probes, while retaining the option to disable affected servers.
## Testing
Add remediation snapshots for unreachable optional HTTP servers, missing required stdio commands, and a required HTTP server with both a missing token and an unreachable URL.
GitOrigin-RevId: 8e8eb743414297561793be51cf3a25e5bd664f27