test: one contract per file (satisfy rainix single-contract gate)

[thedavidmeister]

The rainix rainix-sol-single-contract gate (rainix #214) enforces the Rain convention of one contract / abstract contract per .sol file. 14 pre-existing test files declared more than one contract, which fails the gate and reds main.

This PR splits each offending file so every .sol declares exactly one contract. The primary test contract stays in the original file named after it; each helper / mock / secondary contract moves into its own file named after the contract, carrying the SPDX header, pragma, and the imports it needs. Each original file imports the contracts it still references. This is a pure file reorganization: no test logic or contract behavior changed.

Files split (original -> moved contracts in their own new files)

• test/src/abstract/BaseRainlangExtern.construction.t.sol (5) -> TestableExtern.sol, EmptyPointersExtern.sol, MismatchedExternMoreOpcodes.sol, MismatchedExternMoreIntegrity.sol
• test/src/abstract/BaseRainlangExtern.ierc165.t.sol (2) -> ChildRainlangExtern.sol
• test/src/abstract/BaseRainlangExtern.integrityOpcodeRange.t.sol (2) -> TwoOpExtern.sol
• test/src/abstract/BaseRainlangSubParser.ierc165.t.sol (2) -> ChildRainlangSubParser.sol
• test/src/abstract/BaseRainlangSubParser.subParseLiteral2.t.sol (4) -> HappyPathLiteralSubParser.sol, NoMatchLiteralSubParser.sol, MismatchedLiteralSubParser.sol
• test/src/abstract/BaseRainlangSubParser.subParseWord2.t.sol (3) -> MismatchedWordSubParser.sol, EmptyWordParsersSubParser.sol
• test/src/concrete/RainlangInterpreter.zeroFunctionPointers.t.sol (2) -> ZeroFPRainlangInterpreter.sol
• test/src/concrete/RainlangParser.parseMemoryOverflow.t.sol (2) -> ModifierTestParser.sol
• test/src/concrete/RainlangReferenceExtern.subParserIndexOutOfBounds.t.sol (2) -> MockExternBadLiteralIndex.sol
• test/src/lib/integrity/LibIntegrityCheck.t.sol (3) -> IntegritySingleOp.sol, IntegrityHighwater.sol
• test/src/lib/parse/LibSubParse.badSubParserResult.t.sol (2) -> BadLengthSubParser.sol
• test/src/lib/parse/LibSubParse.constantAccumulation.t.sol (3) -> ConstantReturningSubParser.sol, MultiConstantSubParser.sol
• test/src/lib/parse/LibSubParse.subParseWords.t.sol (2) -> ContextReturningSubParser.sol
• test/src/lib/state/LibInterpreterStateDataContract.t.sol (2) -> LibInterpreterStateDataContractExtern.sol

14 files split into 22 new single-contract files; contract count is conserved (36 contracts before and after).

Verification

• rainix-sol-single-contract exits 0 (no violations remain).
• forge build clean; forge fmt --check clean.
• forge test: 1524 passed. The only 16 failures are pre-existing fork tests that need RPC env vars (ARBITRUM_RPC_URL, BASE_RPC_URL, etc.) not set in the local sandbox; they fail identically on clean main and are in files this PR does not touch.

Greens main and unblocks coverage PRs #534 and #536.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 903207f1-3e1b-4710-bf87-aaecbbf17156

📥 Commits

Reviewing files that changed from the base of the PR and between b3d5081 and e26bc3f.

📒 Files selected for processing (36)

• test/src/abstract/BaseRainlangExtern.construction.t.sol
• test/src/abstract/BaseRainlangExtern.ierc165.t.sol
• test/src/abstract/BaseRainlangExtern.integrityOpcodeRange.t.sol
• test/src/abstract/BaseRainlangSubParser.ierc165.t.sol
• test/src/abstract/BaseRainlangSubParser.subParseLiteral2.t.sol
• test/src/abstract/BaseRainlangSubParser.subParseWord2.t.sol
• test/src/abstract/ChildRainlangExtern.sol
• test/src/abstract/ChildRainlangSubParser.sol
• test/src/abstract/EmptyPointersExtern.sol
• test/src/abstract/EmptyWordParsersSubParser.sol
• test/src/abstract/HappyPathLiteralSubParser.sol
• test/src/abstract/MismatchedExternMoreIntegrity.sol
• test/src/abstract/MismatchedExternMoreOpcodes.sol
• test/src/abstract/MismatchedLiteralSubParser.sol
• test/src/abstract/MismatchedWordSubParser.sol
• test/src/abstract/NoMatchLiteralSubParser.sol
• test/src/abstract/TestableExtern.sol
• test/src/abstract/TwoOpExtern.sol
• test/src/concrete/MockExternBadLiteralIndex.sol
• test/src/concrete/ModifierTestParser.sol
• test/src/concrete/RainlangInterpreter.zeroFunctionPointers.t.sol
• test/src/concrete/RainlangParser.parseMemoryOverflow.t.sol
• test/src/concrete/RainlangReferenceExtern.subParserIndexOutOfBounds.t.sol
• test/src/concrete/ZeroFPRainlangInterpreter.sol
• test/src/lib/integrity/IntegrityHighwater.sol
• test/src/lib/integrity/IntegritySingleOp.sol
• test/src/lib/integrity/LibIntegrityCheck.t.sol
• test/src/lib/parse/BadLengthSubParser.sol
• test/src/lib/parse/ConstantReturningSubParser.sol
• test/src/lib/parse/ContextReturningSubParser.sol
• test/src/lib/parse/LibSubParse.badSubParserResult.t.sol
• test/src/lib/parse/LibSubParse.constantAccumulation.t.sol
• test/src/lib/parse/LibSubParse.subParseWords.t.sol
• test/src/lib/parse/MultiConstantSubParser.sol
• test/src/lib/state/LibInterpreterStateDataContract.t.sol
• test/src/lib/state/LibInterpreterStateDataContractExtern.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-06-15-one-contract-per-file

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