docs: add py-test-swarm AI agent documentation

[SatoryKono]

Adds a new system prompt documentation for the py-test-swarm agent within the .claude/agents/ directory. The instruction set outlines the L1 orchestrator's responsibilities, workflow, metric tracking, and delegation logic for running test audits in the BioETL project.

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PR created automatically by Jules for task 3790874843585832412 started by @SatoryKono

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Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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