soldeer migration

[thedavidmeister]

Migrate from git submodules to soldeer.

Dependencies:

• forge-std → forge-std-1.16.1
• openzeppelin-contracts → @openzeppelin-contracts-4.8.3 (note: soldeer's package layout drops the contracts/ prefix)
• rain.solmem → rain-solmem-0.1.3

CI: drop the bespoke matrix; consume rainix's composite rainix-sol reusable; add the publish wrapper.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 8a4a0c75-4dcd-4fd4-9474-e180e5a5c6cf

📥 Commits

Reviewing files that changed from the base of the PR and between 488f237 and e863c77.

⛔ Files ignored due to path filters (2)

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

📒 Files selected for processing (17)

• .github/workflows/publish-soldeer.yaml
• .github/workflows/rainix.yaml
• .gitignore
• .gitmodules
• .soldeerignore
• README.md
• REUSE.toml
• flake.nix
• foundry.toml
• lib/openzeppelin-contracts
• lib/rain.solmem
• remappings.txt
• test/src/lib/mut/LibConformString.t.sol
• test/src/lib/parse/LibParseChar.isMask.t.sol
• test/src/lib/parse/LibParseChar.skipMask.t.sol
• test/src/lib/parse/LibParseDecimal.unsafeDecimalStringToInt.t.sol
• test/src/lib/parse/LibParseDecimal.unsafeDecimalStringToSignedInt.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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