⚡ Bolt: O(n) hash map lookup for reranking scores

[bashandbone]

💡 What: Pre-compute an $O(n)$ hash map (rank_map) of indices to ranks for mapped scores outside the loop, rather than using an $O(n)$ search for every result inside the generator.
🎯 Why: The previous code used next((j + 1 for j, (idx, _) in enumerate(mapped_scores) if idx == i), -1) inside a generator comprehension iterating over results. This resulted in an $O(n^2)$ algorithmic complexity where $n$ is the number of results, causing unnecessary overhead for large result sets.
📊 Impact: Reduces the time complexity of the batch_rank assignment from $O(n^2)$ to $O(n)$ using $O(1)$ dictionary lookups, significantly improving performance when reranking a large number of chunks.
🔬 Measurement: Benchmark default_reranking_output_transformer with large collections of results/chunks to verify the reduction in processing time.

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PR created automatically by Jules for task 60115920967308526 started by @bashandbone

Summary by Sourcery

Enhancements:

• Precompute a rank map from sorted mapped scores and reuse it for batch_rank assignment to reduce algorithmic complexity from O(n^2) to O(n).

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[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Precomputes a rank lookup map from result indices to their rank in the sorted scores to reduce batch_rank computation from O(n^2) to O(n) in default_reranking_output_transformer.

File-Level Changes

Change	Details	Files
Optimize reranking batch_rank assignment by using a precomputed index-to-rank dictionary instead of repeatedly scanning mapped_scores.	Keep mapped_scores as a sorted list of (index, score) pairs based on score descending. Introduce rank_map dictionary mapping each result index to its 1-based rank using enumerate over mapped_scores. Replace the inline next(...) generator search over mapped_scores with a constant-time rank_map.get(i, -1) lookup when constructing RerankingResult instances. Add a comment documenting the performance motivation to avoid O(n^2) complexity from nested iteration.	src/codeweaver/providers/reranking/providers/base.py

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[github-actions]

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