Experiments to diagnose /research endpoint topic-relevance bug

[Copilot]

The /research endpoint returns content unrelated to the requested topic. Manual probing confirmed the code is calling the endpoint correctly (GET /research?topic=<value> with X-API-Key) — the bug is in the endpoint itself.

Experiments (research.experiment.ts)

Four vitest tests against the live API to characterize the failure mode:

• Consistency — same topic called 5×; measures what fraction of responses are on-topic
• Specificity — three distinct topics; checks whether responses differ per topic (endpoint actually uses topic param vs. ignoring it)
• Keyword check — full response printed for solar energy; asserts at least one expected keyword is present
• Empty rate — tracks how often the endpoint returns an empty/near-empty response across 5 calls

Wiring

• package.json — test:experiments script runs only the experiment file
• ci.yml — new step runs test:experiments with ELYOS_API_KEY and continue-on-error: true; results are visible in check logs regardless of pass/fail