Add magic number to parse error offsets

[thedavidmeister]

Summary

• Parse error offsets are now tagged with a magic number in the high bits so callers can distinguish Rain parse errors from other revert data
• Adds tagErrorOffset, parseOffset, and isRainParseError to LibParseError
• Fixes build warnings (view/pure mutability)

Closes #152, closes #153.

Test plan

• All LibParseError unit tests pass (including round-trip, fuzz, and negative tests)
• All 1581 non-prod tests pass locally
• Prod deploy tests pass after on-chain deployment
• CI green

🤖 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: d1d669c0-64a1-43c2-b57a-0d44904a1f30

📥 Commits

Reviewing files that changed from the base of the PR and between 1180174 and d952d4b.

⛔ Files ignored due to path filters (5)

• flake.lock is excluded by !**/*.lock
• src/generated/Rainlang.pointers.sol is excluded by !**/generated/**
• src/generated/RainlangExpressionDeployer.pointers.sol is excluded by !**/generated/**
• src/generated/RainlangParser.pointers.sol is excluded by !**/generated/**
• src/generated/RainlangReferenceExtern.pointers.sol is excluded by !**/generated/**

📒 Files selected for processing (39)

• script/BuildPointers.sol
• src/lib/parse/LibParseError.sol
• test/src/concrete/RainlangExpressionDeployer.parse2.t.sol
• test/src/concrete/RainlangExpressionDeployer.parsePragma1.t.sol
• test/src/concrete/RainlangParser.parserPragma.t.sol
• test/src/lib/eval/LibEval.inputsLengthMismatch.t.sol
• test/src/lib/integrity/LibIntegrityCheck.io.t.sol
• test/src/lib/op/logic/LibOpEnsure.t.sol
• test/src/lib/parse/LibParse.comments.t.sol
• test/src/lib/parse/LibParse.lhsOverflow.t.sol
• test/src/lib/parse/LibParse.literalIntegerDecimal.t.sol
• test/src/lib/parse/LibParse.literalString.t.sol
• test/src/lib/parse/LibParse.missingFinalSemi.t.sol
• test/src/lib/parse/LibParse.nOutput.t.sol
• test/src/lib/parse/LibParse.namedLHS.t.sol
• test/src/lib/parse/LibParse.operand8M1M1.t.sol
• test/src/lib/parse/LibParse.operandDisallowed.t.sol
• test/src/lib/parse/LibParse.operandDoublePerByteNoDefault.t.sol
• test/src/lib/parse/LibParse.operandM1M1.t.sol
• test/src/lib/parse/LibParse.operandSingleFull.t.sol
• test/src/lib/parse/LibParse.unclosedLeftParen.t.sol
• test/src/lib/parse/LibParse.unexpectedLHS.t.sol
• test/src/lib/parse/LibParse.unexpectedRHS.t.sol
• test/src/lib/parse/LibParse.unexpectedRightParen.t.sol
• test/src/lib/parse/LibParseError.t.sol
• test/src/lib/parse/LibParseInterstitial.t.sol
• test/src/lib/parse/LibParseOperand.parseOperand.t.sol
• test/src/lib/parse/LibParsePragma.keyword.t.sol
• test/src/lib/parse/LibParseState.endLine.OpcodeIOOverflow.t.sol
• test/src/lib/parse/LibParseState.endLine.t.sol
• test/src/lib/parse/LibParseState.pushLiteral.t.sol
• test/src/lib/parse/LibParseState.pushSubParser.t.sol
• test/src/lib/parse/LibSubParse.subParseLiteral.t.sol
• test/src/lib/parse/literal/LibParseLiteral.dispatch.t.sol
• test/src/lib/parse/literal/LibParseLiteralDecimal.parseDecimalFloat.t.sol
• test/src/lib/parse/literal/LibParseLiteralHex.parseHex.t.sol
• test/src/lib/parse/literal/LibParseLiteralString.boundString.t.sol
• test/src/lib/parse/literal/LibParseLiteralString.parseString.t.sol
• test/src/lib/parse/literal/LibParseLiteralSubParseable.parseSubParseable.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch magic-number-error-offset

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