⚡ Bolt: Batch concurrent fs operations in ArtifactStore.gc

[google-labs-jules]

💡 What: Refactored sequential fs.stat and fs.rm loops in ArtifactStore.gc to use batched concurrent Promise.all requests (chunk size of 10).
🎯 Why: To improve garbage collection performance for a large number of artifacts and to avoid EMFILE limit issues.
📊 Impact: Significantly faster artifact garbage collection by batching I/O operations without causing EMFILE limits.
🔬 Measurement: Run bun test ./tests/unit/sub-agent/artifacts/ArtifactStore.test.ts to confirm tests pass successfully and verify logic stability.

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PR created automatically by Jules for task 11262573497288278515 started by @YoungSx

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