Route shadowed arguments call targets through unified bytecode

[rogeralsing]

Summary

• allow call-target preparation to resolve parameter/lexical arguments bindings as activation slots
• keep implicit arguments-object call targets declined before VM execution
• update the decline contract and durable arguments boundary wording

Verification

• rtk dotnet test tests/Asynkron.JsEngine.Tests -c Release --filter "FullyQualifiedNameUnifiedBytecodeProductionInvocationTests.CallParameterNamedArguments_UsesUnifiedBytecodeProductionFastPath|FullyQualifiedNameUnifiedBytecodeProductionInvocationTests.UpdateParameterNamedArguments_UsesUnifiedBytecodeProductionFastPath|FullyQualifiedNameUnifiedBytecodeProductionEligibilityTests.Evaluate_CallParameterNamedArguments_AcceptsAsActivationSlot|FullyQualifiedNameUnifiedBytecodeProductionEligibilityTests.Evaluate_CallImplicitArgumentsObject_DeclinesWithArgumentsDependency|FullyQualifiedNameUnifiedBytecodeProductionEligibilityTests.Evaluate_ArgumentsAccess_DeclinesWithArgumentsDependency|FullyQualifiedNameExpressionProgramCoverageMapTests.UnifiedBytecodeExpansionContract_ListsRequiredHeadingsAndCurrentEnums"
• rtk dotnet test tests/Asynkron.JsEngine.Tests -c Release --filter "FullyQualifiedNameUnifiedBytecodeProductionEligibilityTests|FullyQualifiedNameExpressionProgramCoverageMapTests.UnifiedBytecodeExpansionContract_ListsRequiredHeadingsAndCurrentEnums|FullyQualifiedName~UnifiedBytecodeProductionInvocationTests"
• rtk dotnet test tests/Asynkron.JsEngine.Tests -c Release --filter "FullyQualifiedName~ActivationSemanticsProofPackTests"
• rtk rg "EvaluateExpression(|ProfileEvaluateExpression(" src/Asynkron.JsEngine/Ast/TypedAstEvaluator.ExecutionPlanRunner* (no matches)
• rtk ./tools/profile forloop --memory (Total allocated 6.85 MB)
• rtk git diff --check

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