jif 6915bac7ba
Add reciprocal rank fusion skill selection ( #34547 ) ...
## What changed
- Add a skill selector that uses reciprocal rank fusion to combine the top 50 results from the weighted lexical and character n-gram selectors.
- Prefer candidates supported by both rankings, with deterministic rank and identifier tie-breakers, and propagate truncation metadata from both selectors.
- Include the fused selector in the shadow-selection experiment under `rrf_lexical_char_v1`.
## Testing
- Add unit coverage for cross-ranking support, deterministic tie-breaking, and combined input-bound reporting.
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6915bac7ba