⚡ Bolt: [performance improvement] Pre-compute basenames and use single-pass Sets for diffTests

[google-labs-jules]

• 💡 What: Replaced multiple nested .filter().some() loops with a single-pass cross-comparison using Sets and pre-computed basenames for code objects in test matching logic.
• 🎯 Why: To avoid redundant string processing overhead (basename calls inside inner loops) and multiple O(N*M) passes, significantly improving the performance of comparing documented tests against code tests.
• 📊 Impact: Reduces the time complexity from multiple O(NM) passes with internal string manipulations to a single O(NM) pass with pre-computed O(1) property lookups, speeding up validation when a large number of tests exist.
• 🔬 Measurement: Run the node --test tests/*.test.mjs suite or manually benchmark diffTests execution with thousands of test files.

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PR created automatically by Jules for task 5539511900185621125 started by @raccioly

[google-labs-jules]

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