feat: add py-test-swarm agent instruction

[SatoryKono]

Added .claude/agents/py-test-swarm.md containing instructions for the py-test-swarm agent. This agent acts as a hierarchical L1 test orchestrator for the BioETL project.

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PR created automatically by Jules for task 15114549616368249074 started by @SatoryKono

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Quality Gate passed

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0 Accepted issues

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0.0% Coverage on New Code
0.0% Duplication on New Code

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