[deep-report] Add GitHub MCP auth-test fallback when remote toolsets are unavailable

[github-actions]

Description

The GitHub Remote MCP Authentication Test fails because GitHub MCP toolsets are not loaded in the runner. Add a fallback (or explicit preflight) to use mode: local when remote toolsets are unavailable, and surface a clearer error when toolsets fail to load.

Expected Impact

• Restores MCP auth-test reliability and improves GitHub MCP availability checks.
• Reduces false negatives that block MCP-dependent workflows.

Suggested Agent

MCP Tooling Agent

Estimated Effort

Quick (< 1 hour)

Data Source

DeepReport Intelligence Briefing - February 10, 2026 (discussion #14726)

AI generated by DeepReport - Intelligence Gathering Agent

• expires on Feb 12, 2026, 3:40 PM UTC