I Kartik Reddy ab40c90118 fix: avoid quadratic dedup in RAG merge paths (#18135) ...

## Summary
Fixes #18025. Both merge paths deduplicated IDs by scanning a plain list
(`item not in list`) inside a loop while appending — O(n²) per merge.
Replaced with a set-backed `seen` check alongside the existing ordered
list: same order, same dedup result, O(n).

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Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

2026-08-20 11:50:27 +08:00

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