Admit typeof implicit arguments

[rogeralsing]

Summary

• Route bounded implicit typeof arguments through production unified bytecode as literal "object".
• Keep full implicit arguments object access, update, and call behavior declined.
• Update the unified-bytecode expansion contract and route tests.

Verification

• rtk dotnet test tests/Asynkron.JsEngine.Tests -c Release --filter 'FullyQualifiedNameUnifiedBytecodeProductionEligibilityTests.Evaluate_TypeOfImplicitArgumentsObject_AcceptsLiteralObjectType|FullyQualifiedNameUnifiedBytecodeProductionEligibilityTests.Evaluate_ArgumentsAccess_DeclinesWithArgumentsDependency|FullyQualifiedNameUnifiedBytecodeProductionInvocationTests.TypeOfImplicitArgumentsObject_UsesUnifiedBytecodeProductionFastPath|FullyQualifiedNameUnifiedBytecodeProductionInvocationTests.TypeOfParameterNamedArguments_UsesUnifiedBytecodeProductionFastPath|FullyQualifiedNameUnifiedBytecodeProductionInvocationTests.ParameterNamedArguments_UsesUnifiedBytecodeProductionFastPath|FullyQualifiedNameExpressionProgramCoverageMapTests.UnifiedBytecodeExpansionContract_ListsRequiredHeadingsAndCurrentEnums'
• rtk dotnet test tests/Asynkron.JsEngine.Tests -c Release --filter 'FullyQualifiedNameUnifiedBytecodeProductionEligibilityTests|FullyQualifiedNameUnifiedBytecodeProductionInvocationTests|FullyQualifiedNameUnifiedBytecodeProductionSpreadCallTests|FullyQualifiedNameUnifiedBytecodeProductionConstructCallTests|FullyQualifiedNameExpressionProgramLoweringTests|FullyQualifiedNameExpressionProgramCoverageMapTests|FullyQualifiedName~AstFreeExecutionAssertionTests'
• rtk rg 'EvaluateExpression(|ProfileEvaluateExpression(' src/Asynkron.JsEngine/Ast/TypedAstEvaluator.ExecutionPlanRunner*
• rtk dotnet build src/Asynkron.JsEngine/Asynkron.JsEngine.csproj -c Release
• rtk git diff --check

[Copilot]

Pull request overview

This PR extends production unified-bytecode routing to allow the specific case of typeof arguments when it refers to the implicit arguments object, compiling it as a literal "object" while keeping other implicit arguments behaviors (access/update/call-target) declined.

Changes:

• Admit plans whose only implicit-arguments dependency is typeof arguments by scanning for that bounded pattern.
• Compile typeof arguments (implicit, non-slot-resolved) as a LoadLiteral "object" in unified bytecode instead of declining compilation.
• Update eligibility/invocation tests and the unified-bytecode expansion contract documentation to reflect the new admitted route.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/Asynkron.JsEngine.Tests/UnifiedBytecodeProductionInvocationTests.cs	Updates invocation test to expect production unified-bytecode fast-path logging for typeof arguments.
tests/Asynkron.JsEngine.Tests/UnifiedBytecodeProductionEligibilityTests.cs	Updates eligibility test to accept typeof arguments and assert "object" is emitted as a literal constant.
src/Asynkron.JsEngine/Execution/UnifiedBytecode/UnifiedBytecodeProductionEligibility.cs	Adds bounded plan scan for the “only typeof arguments” pattern and removes the prior typeof arguments decline in expression scanning.
src/Asynkron.JsEngine/Execution/UnifiedBytecode/UnifiedBytecodeCompiler.cs	Compiles implicit typeof arguments as a literal "object" when it cannot be resolved to an activation slot.
src/Asynkron.JsEngine/Ast/TypedAstEvaluator.SyncFunctionInvoker.cs	Adds an activation-descriptor gate to bypass ArgumentsObjectDependency for the bounded typeof arguments case.
docs/unified-bytecode-expansion-contract.md	Documents the new behavior for ArgumentsObjectDependency/pre-gate:usesArguments regarding implicit typeof arguments.

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