gha-cache-proof 1.0.0

GitHub Actions cache compatibility checker and local cache-store receipt tool for offline CI
Documentation 
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# Contributing

Run the local gates before sending changes:

```powershell
cargo fmt --check
cargo test --locked
cargo clippy --locked --all-targets --all-features -- -D warnings
```

Keep new diagnostics receipt-backed. If a rule depends on expression semantics, use `gha-expression-proof` rather than duplicating parser behavior here.