listForRadar previously called findByAgentIds() and JSON-parsed every chunk to
compute questionsCount, subagentsCount, and compactionsCount. Switch to
findMetricsByAgentIds() which reads the pre-computed agent_metrics table,
eliminating the chunk scan and per-row JSON.parse entirely.
Add two new test cases: agent with no metrics row returns zero counts, and
listForRadar response rows never carry chunk content.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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