ci: use upstream rainix-rs-test reusable

[thedavidmeister]

Summary

• Drops the local cargo test matrix from rainix.yaml; replaced by a one-line wrapper calling rainlanguage/rainix/.github/workflows/rainix-rs-test.yaml@main (introduced in ci: reusable rainix-rs-test workflow rainix#150).
• Local rainix.yaml trims to a single-job workflow for the only float-specific task left: test-wasm-build (cross-compile to wasm32).
• Drops forge soldeer install + forge build setup since the rust crate compiles standalone via the committed crates/float/abi/ artifacts.
• Drops deploy-related env vars from the workflow (test-wasm-build doesn't deploy).
• Adds Swatinem/rust-cache@v2 to the test-wasm-build job for the same incremental-rebuild cache.
• Bumps flake.lock to rainix@5cf5346 to pick up the rs-test reusable + rust-cache + fetch-depth cleanup.

Test plan

• CI green: rainix-rs-test / rs-test (ubuntu-latest), rainix-rs-test / rs-test (macos-latest), and Rainix CI / test-wasm-build all pass.
• Confirm rs-test runtime improvement on warm-cache subsequent runs.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 9ebdf2cf-22f1-4cce-8c82-80c8d5f50132

📥 Commits

Reviewing files that changed from the base of the PR and between 35378d5 and b8b7ba8.

⛔ Files ignored due to path filters (1)

• flake.lock is excluded by !**/*.lock

📒 Files selected for processing (3)

• .github/workflows/rainix-rs-test.yaml
• .github/workflows/rainix-rs-wasm.yaml
• .github/workflows/rainix.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-10-rs-test-reusable

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[github-actions]

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S/M/L PR Classification Guidelines:

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