fix(ci): cfg(unix)-gate golden test helpers — windows clippy dead-code on main

[div0-space]

main CI czerwone od merge #35: windows-latest, clippy -D warnings, 5× dead_code.

Test golden_precision_side_index_and_warm_path_contract je #[cfg(unix)], ale jego helpery (GoldenSet/GoldenPair/GoldenEvidence/canonical_card/write_projection) były bezwarunkowe — pod Windowsym nic ich nie używo. Gate tym samym cfg(unix); unix build bez zmian (clippy+testy lokalnie GREEN, pre-push suite GREEN).

Wykryte w post-merge vc-review PR #35 (kolejka merguje bez windows-checka — required-checks nie obejmujóm windows-latest; osobny temat konfiguracyjny dlo operatora).

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[Copilot]

Pull request overview

This PR fixes Windows CI failures (clippy -D warnings) caused by dead_code warnings in src/overlay.rs tests: a Unix-only golden test was #[cfg(unix)], but its helper structs/functions were previously compiled on all platforms and became unused on Windows.

Changes:

• Added #[cfg(unix)] to golden-test-only helper structs (GoldenSet, GoldenPair, GoldenEvidence).
• Added #[cfg(unix)] to golden-test-only helper functions (canonical_card, write_projection).
• Keeps Unix behavior unchanged while preventing Windows from compiling unused golden helpers.

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[gemini-code-assist]

Code Review

This pull request adds #[cfg(unix)] attributes to several test-related structs and helper functions in src/overlay.rs to restrict their compilation to Unix-like platforms. The review feedback correctly points out that this change will lead to unused import warnings on non-Unix platforms (such as Windows), which can cause build failures under strict compiler settings. It is recommended to conditionally import these dependencies using #[cfg(unix)] as well.

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[gemini-code-assist]

Poprzez oznaczanie GoldenSet, GoldenPair, GoldenEvidence, canonical_card oraz write_projection atrybutem #[cfg(unix)], kilka importów na początku modułu tests (linie 1469–1476) staje się całkowicie nieużywanych na platformach innych niż Unix (np. na Windowsie). Przy restrykcyjnych ustawieniach Clippy (clippy -D warnings lub #[deny(warnings)]), spowoduje to błędy kompilacji typu unused_imports podczas budowania na Windowsie.

Aby temu zapobiec, należy również warunkowo importować te zależności za pomocą #[cfg(unix)]:

#[cfg(unix)]
use crate::store::write_canonical_projection_at;
#[cfg(unix)]
use aicx_parser::engine::{
    AgentKind, BoundaryFlags, ParseStatus, TurnRole, VisibleCompleteness,
};
#[cfg(unix)]
use aicx_parser::projections::{
    CANONICAL_CARD_SCHEMA, CanonicalProjection, ProjectAttribution, ProjectBucket,
    TimelineFrame,
};