Files
codex/codex-rs/ext
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.

GitOrigin-RevId: 3165136b8729ea3a9484f25c7f2ce0f91fb8aaa9
2026-07-21 13:49:22 +00:00
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