Add LibParseMeta.lookupWord unit test

[thedavidmeister]

Adds a direct unit test for LibParseMeta.lookupWord (defined in the rain-interpreter-interface dependency and consumed by the rainlang parser via LibParse/BaseRainlangSubParser). The test covers both paths with discriminating assertions:

• Hit path: builds meta from known words via LibGenParseMeta.buildParseMetaV2, looks each up, asserts exists == true and the exact returned opcode index matches the authoring position.
• Miss path: looks up words not built into the meta, asserts exists == false and index == 0.

Tests:

• testLibParseMetaLookupWordKnown — three known words resolve to indices 0/1/2.
• testLibParseMetaLookupWordNotFound — an absent word is not found, index 0.
• testLibParseMetaLookupWordSingleDepth — single word at depth 1 found at index 0; unrelated word not found.
• testLibParseMetaLookupWordRoundtripFuzz — fuzzed words round-trip to their indices; an unrelated word is not found.

Placed at test/src/lib/parse/LibParseMeta.lookupWord.t.sol, mirroring the LibParseMeta import path per the source-organized test convention.

Mutation-validated: forcing the hit return to (true, 0) fails the index assertions (Known, RoundtripFuzz); forcing the bit-not-set miss return to (true, 0) fails the found-flag assertions (NotFound, SingleDepth, RoundtripFuzz). Restored to baseline, all 4 tests green. Test-only change; no source/bytecode change.

Closes #249

🤖 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: c36c73e4-c117-41e0-ba11-6e8b273013a5

📥 Commits

Reviewing files that changed from the base of the PR and between b3d5081 and 10d48b4.

📒 Files selected for processing (37)

• 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/LibParseMeta.lookupWord.t.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 2026-06-14-issue-249

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