soldeer migration

[thedavidmeister]

Migrate from git submodules to soldeer, mirroring rain.solmem, rain.math.binary, and rain.math.saturating. Closes #6.

Note: rain.deploy ships deterministic Zoltu addresses to prod. Source-byte changes (even cosmetic) shift addresses. The only source-side change here is rewriting two import strings in LibRainDeploy.sol from forge-std/... to forge-std-1.16.1/src/... — the resolved files are byte-identical, so the compiled creation code should be unchanged. Worth confirming the codehash on the PR before merging if any consumer pins our LibRainDeploy creation code.

Changes

• foundry.toml: libs=["dependencies"], [dependencies] forge-std="1.16.1", [soldeer] recursive_deps=false
• forge-std submodule and .gitmodules removed
• Source AND test imports updated to forge-std-1.16.1/src/* (LibRainDeploy itself imports Vm and console2 from forge-std for forge scripting cheatcodes)
• .soldeerignore with depth-anchored patterns
• REUSE.toml extended for .soldeerignore, remappings.txt, soldeer.lock
• CI: drop submodules:recursive, drop sol-prelude, add forge soldeer install before each task; static job moved to rainix's reusable
• Publish workflow: thin wrapper calling rainix's reusable
• flake bumped; default devShell now points at sol-shell
• README rewritten

Test plan

• forge t est passes (30/30) locally on the soldeer-managed forge-std
• CI green on this PR
• Confirm LibRainDeploy creation-code keccak unchanged vs main (Zoltu address invariant)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 9c386dc3-a501-418d-81ea-e53c4f8feeb7

📥 Commits

Reviewing files that changed from the base of the PR and between 43a6ed3 and 38ccb59.

⛔ Files ignored due to path filters (2)

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

📒 Files selected for processing (15)

• .github/workflows/publish-soldeer.yaml
• .github/workflows/rainix-sol-static.yaml
• .github/workflows/rainix.yaml
• .gitignore
• .gitmodules
• .soldeerignore
• README.md
• REUSE.toml
• flake.nix
• foundry.toml
• lib/forge-std
• remappings.txt
• slither.config.json
• src/lib/LibRainDeploy.sol
• test/src/lib/LibRainDeploy.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-09-soldeer

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