copy-artifacts: drop the Foundry build cache (no-op for a clean-build check)

[thedavidmeister]

copy-artifacts caches cache/ only (not out/) to keep its determinism assert honest. But forge needs out/ artifacts present to skip compilation — with out/ absent it recompiles to regenerate them, so cache/ alone yields no real speedup (measured: Build Solidity stayed ~105s). The actions/cache save/restore was therefore pure overhead.

Remove it — copy-artifacts is now a clean determinism check with no Foundry cache. The cache+out workflows (sol-test, sol-static, manual-sol-artifacts, rainix test.yml) keep the cache, where it genuinely skips recompilation.

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Reviewing files that changed from the base of the PR and between 8b2c684 and fadfc06.

📒 Files selected for processing (1)

• .github/workflows/rainix-copy-artifacts.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-27-copy-no-forge-cache

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