chore: de-submodule to soldeer (rain.interpreter -> rainlang)

[thedavidmeister]

Replaces the lib/rain.interpreter git submodule with explicit soldeer deps. rain.interpreter is now the rainlang soldeer package; declares the full flattened interpreter dep tree (17 pkgs) at the versions it pins.

• versioned soldeer imports (no custom remappings); reconciled the rainlang rename (BaseRainterpreter*NPE2 -> BaseRainlang*) + interface path drift
• extern bad-inputs tests assert ExternIntegrityInputsMismatch via checkUnhappyParse2 (matching rainlang's RainlangReferenceExtern tests) instead of the opcode-level BadOpInputsLength
• regenerated pointers/meta/proof fixtures; forge test 12/12 passing locally
• CI: bespoke rainix.yml -> reusable rainix-sol.yaml; git-clean adds soldeer install + drops submodule checkout

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: ec401387-445f-4b09-a7c8-22467184240f

📥 Commits

Reviewing files that changed from the base of the PR and between e5cae11 and b4e1d0c.

⛔ Files ignored due to path filters (3)

• foundry.lock is excluded by !**/*.lock
• soldeer.lock is excluded by !**/*.lock
• src/generated/MerkleWords.pointers.sol is excluded by !**/generated/**

📒 Files selected for processing (22)

• .github/workflows/git-clean.yaml
• .github/workflows/manual-sol-artifacts.yaml
• .github/workflows/rainix-sol.yaml
• .github/workflows/rainix.yml
• .gitignore
• .gitmodules
• REUSE.toml
• foundry.toml
• lib/rain.interpreter
• remappings.txt
• script/BuildAuthoringMeta.sol
• script/BuildPointers.sol
• script/Deploy.sol
• script/build.sh
• src/abstract/MerkleExtern.sol
• src/abstract/MerkleSubParser.sol
• src/concrete/MerkleWords.sol
• src/lib/op/LibOpMerkleProofVerify.sol
• src/lib/parse/LibMerkleSubParser.sol
• test/proof/LibTestProof.sol
• test/src/concrete/MerkleWords.merkleProofVerify.t.sol
• test/src/lib/op/LibOpMerkleProofVerify.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-06-03-desubmodule-soldeer

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[thedavidmeister]

Reviewed b4e1d0c: APPROVE — de-submodule to soldeer, CI on reusable rainix-sol + copy-artifacts, PRIVATE_KEY deploy. Extern input-mismatch tests reconciled to ExternIntegrityInputsMismatch; 12/12 merkle-proof tests + full suite green.