🧪 [testing improvement] Add tests for recordTeamRunStart

[toreleon]

🎯 What: The testing gap addressed: Missing tests for recordTeamRunStart in src/agent/team/storage.ts
📊 Coverage: Covered the happy path (verifying correct insertion, ticker uppercase transformation, timestamps) and unique constraint error handling when duplicate runIds are passed.
✨ Result: Improved test coverage and reliability for team run DB interactions.

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PR created automatically by Jules for task 4500573855189016825 started by @toreleon

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