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update-pairwise-rating

Update candidate latent ratings and uncertainty from sequential pairwise outcomes using an explicitly chosen Bradley-Terry/Elo/Glicko/TrueSkill-style update model.

skills/update-pairwise-rating/SKILL.md

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# update-pairwise-rating
## Purpose
Update latent candidate ratings and uncertainty from a pairwise outcome using an explicitly chosen rating model.
## Input contract
```yaml
required: [prior_ratings, pairwise_outcome, rating_model, update_parameters]
optional: [rating_history, draw_policy, uncertainty_floor]
constraints: [model, outcome direction, confidence, and parameter values are recorded]
```
## Procedure
1. Validate the pairwise outcome and retrieve the two prior rating states.
2. Apply the declared Bradley-Terry, Elo, Glicko, TrueSkill, or equivalent update equations.
3. Update both ratings and uncertainty, preserving the pre-update state and the reason for the magnitude.
4. Emit the updated ratings, uncertainty change, and consistency flags for downstream audit.