CI: namespace Foundry cache keys by mode (fix #203 cross-restore)

[thedavidmeister]

Follow-up review of #203 caught a real bug CI didn't: all sol workflows shared one cache key + restore-keys prefix (foundry-${{ runner.os }}-). GitHub's cache archive reflects the saver's path set, and a matching-key restorer extracts that archive regardless of its own path — so the cache-only (determinism: copy-artifacts) and cache+out (build/test) groups cross-restore:

• cache-only could restore a stale out/ (undermines the fresh-build intent — though forge build reconciles, so the assert stays valid)
• cache+out could restore an entry missing out/ (silently loses the speedup)

Split into distinct namespaces so the groups never share an entry:

• rainix-copy-artifacts → foundry-co-${{ runner.os }}-…
• rainix-sol-test / -sol-static / -manual-sol-artifacts / test.yml → foundry-full-${{ runner.os }}-…

rainix-build-pointers is intentionally left on the old prefix — #204 retires it, and it's now alone in that namespace (no collision).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

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Run ID: caee0139-d1e2-471c-a637-b06233721b17

📥 Commits

Reviewing files that changed from the base of the PR and between 4648a61 and ec1464b.

📒 Files selected for processing (5)

• .github/workflows/rainix-copy-artifacts.yaml
• .github/workflows/rainix-manual-sol-artifacts.yaml
• .github/workflows/rainix-sol-static.yaml
• .github/workflows/rainix-sol-test.yaml
• .github/workflows/test.yml

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• Create PR with unit tests
• Commit unit tests in branch 2026-05-27-cache-key-namespaces

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