Refactor participant score

[squadgazzz]

Description

Refactors the driver Participant struct's score field, which makes it non-optional by introducing new ranking types: Unscored and Scored, that also replace the Unranked type. The Ranked type now only contains participants with scores. One of the prerequisites for #4010 before extracting this logic into a separate crate.

Changes

• Unranked -> Unscored + Scored
• Participant's score is non-optional now
• No more panics/expectations

How to test

Existing tests

[Copilot]

Pull request overview

This PR refactors the participant score management from an optional field on Solution to a mandatory part of the participant state, introducing a type-state pattern that tracks scoring status through the type system: Unscored → Scored → Ranked. This eliminates the need for runtime score validation (expects/panics) by making invalid states unrepresentable at compile time.

Key Changes:

• Introduced Scored state type containing a non-optional score, replacing the Unranked type
• Moved score from Solution to Participant state, making it type-safe
• Renamed Ranked enum to RankType and created a new Ranked state struct containing both rank type and score

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
crates/autopilot/src/domain/competition/participant.rs	Core refactor: Added Scored state type, split Ranked into RankType enum and Ranked state, added score() methods on Scored and Ranked, replaced set_score() with type-safe with_score() transition
crates/autopilot/src/domain/competition/mod.rs	Removed optional score field from Solution and its associated score() method, updated public exports to include new types
crates/autopilot/src/domain/competition/winner_selection.rs	Updated arbitration logic to use type-state transitions, refactored compute_scores_by_solution to return scored participants, updated all score access to use participant.score() instead of solution().score()
crates/autopilot/src/run_loop.rs	Updated type signatures to use Unscored instead of Unranked, changed score access from solution().score() to score()
crates/autopilot/src/shadow.rs	Updated imports and type signatures, changed score access pattern
crates/autopilot/src/infra/persistence/mod.rs	Updated score access from solution().score() to score()

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