feat: migrate to soldeer + use upstream CI reusable

[thedavidmeister]

Summary

Drop git submodules in favour of soldeer-managed dependencies, in preparation for publishing this repo to soldeer.xyz so downstream consumers (rain.interpreter, etc.) can pick it up via a versioned dep.

• foundry.toml: [dependencies] block, [soldeer] recursive_deps = false, libs = ["dependencies"]
• .soldeerignore: exclude dev/CI metadata from the published zip
• .github/workflows/publish-soldeer.yaml: tag-driven publish via rainix reusable
• .github/workflows/rainix.yaml → rainix-sol.yaml: thin wrapper around upstream rainix sol reusable
• REUSE.toml: cover soldeer.lock and .soldeerignore; drop .gitmodules
• Imports rewritten to versioned soldeer paths
• .gitignore: ignore dependencies/, remappings.txt, .env, .pre-commit-config.yaml, .claude (and target for rain.metadata)

Test plan

• compile clean locally
• reuse lint clean
• After merge: tag v0.1.0 to trigger soldeer publish

Generated with Claude Code.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: f44a0ba3-8a1f-4412-a2dc-7b2df7200aea

📥 Commits

Reviewing files that changed from the base of the PR and between 474ab47 and 4b6ece9.

⛔ Files ignored due to path filters (1)

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

📒 Files selected for processing (19)

• .github/workflows/publish-soldeer.yaml
• .github/workflows/rainix-sol.yaml
• .github/workflows/rainix.yaml
• .github/workflows/subgraph-test.yaml
• .gitignore
• .gitmodules
• .soldeerignore
• REUSE.toml
• foundry.toml
• lib/forge-std
• lib/rain.deploy
• script/Deploy.sol
• test/concrete/MetaBoard.hash.t.sol
• test/concrete/MetaBoard.t.sol
• test/lib/LibDescribedByMeta.emitForDescribedAddress.t.sol
• test/lib/LibMeta.checkMetaHashedV1_2.t.sol
• test/lib/LibMeta.checkMetaUnhashedV1_2.t.sol
• test/lib/LibMeta.isRainMetaV1_2.t.sol
• test/lib/deploy/LibMetaBoardDeploy.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-12-soldeer

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[github-actions]

@coderabbitai assess this PR size classification for the totality of the PR with the following criterias and report it in your comment:

S/M/L PR Classification Guidelines:

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Small (S)

Characteristics:

• Simple bug fixes, typos, or minor refactoring
• Single-purpose changes affecting 1-2 files
• Documentation updates
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Review Effort: Would have taken 5-10 minutes

Examples:

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• Import statement cleanup

Medium (M)

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• Breaking changes with backward compatibility
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Review Effort: Would have taken 15-30 minutes

Examples:

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Large (L)

Characteristics:

• Major feature implementations
• Breaking changes or API redesigns
• Complex refactoring across multiple modules
• New architectural patterns or significant design changes
• Changes requiring deep context and multiple review rounds

Review Effort: Would have taken 45+ minutes

Examples:

• Complete new feature with frontend/backend changes
• Protocol upgrades or breaking changes
• Major architectural refactoring
• Framework or technology upgrades

Additional Factors to Consider

When deciding between sizes, also consider:

• Test coverage impact: More comprehensive test changes lean toward larger classification
• Risk level: Changes to critical systems bump up a size category
• Team familiarity: Novel patterns or technologies increase complexity

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