fix: ChatBase constructor ignores history parameters

[jonasstenberg]

The ChatBase constructor accepts comprehensiveHistory and curatedHistory parameters but never uses them—both fields are always initialized as empty ArrayList instances regardless of what's passed in.

The Bug

// Before (broken)
ChatBase(List comprehensiveHistory, List curatedHistory) {
  this.comprehensiveHistory = new ArrayList<>();
  this.curatedHistory = new ArrayList<>();
}

The Fix

// After (fixed)
ChatBase(List comprehensiveHistory, List curatedHistory) {
  this.comprehensiveHistory = comprehensiveHistory;
  this.curatedHistory = curatedHistory;
}

Impact

This bug would prevent any functionality that relies on initializing a chat session with existing conversation history from working correctly.

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