Degrade retrieval to test CI gate

[NaveenBuidl]

Intentional degradation PR to verify the eval CI gate blocks lower retrieval quality.

Change:

• retrieval_k: 4 -> 1

Expected:

• Eval Gate should fail if ContextualPrecisionMetric drops below threshold.

[Copilot]

Pull request overview

This PR intentionally degrades retrieval quality by lowering the configured number of retrieved chunks to validate that the eval CI gate blocks regressions.

Changes:

• Commented out the prior retrieval_k: 4 value.
• Set retrieval_k: 1 in config.yaml to force lower retrieval quality and trigger the CI eval gate.

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[Copilot]

This PR changes the committed default retrieval_k to a degraded value. Since the CI workflow already supports overriding retrieval_k via workflow_dispatch (see .github/workflows/eval-gate.yml), consider keeping config.yaml at the normal default and exercising the gate by running the workflow with an override or by introducing a separate CI-only config. This avoids accidentally merging a low-quality default into mainline usage.