A duplicate agent id slipping through useAgents (race between initial fetch
and an SSE refresh, or backend pagination edge case) was flooding React with
"Encountered two children with the same key" warnings. With the active panel
re-rendering on every transcript event the warning fired every few ms and
snowballed the console buffer until the page crashed with OOM.
Dedupe by id at the hook (so every consumer benefits) and again in
ActiveAgentsPanel as belt-and-braces.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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