test(mcp): cover find-opportunities searchQuery, goal-spec, and token-fallback paths - #6112

Sandboxed PR scan did not produce a valid agent receipt. No existing comments or labels on this PR. The analysis confirms this is a clean scan — the only changed file is a test file adding unit test coverage for existing runFindOpportunities branches. There are no CI/CD changes, no lifecycle hooks, no malicious intent indicators, and no skill mutations.

Now I'll execute the clean-scan GitHub operations: upsert the clean-scan comment, update managed labels, and complete the check run.