Admit deep computed member calls

[rogeralsing]

Summary

• allow computed member-call preparation to use the existing deep named receiver-chain support
• convert root.child.branch.leaf[key](value) from a stale property-read boundary decline to an admitted production shape
• add a runtime route-hit proof that preserves the deepest receiver as this

Verification

• rtk dotnet test tests/Asynkron.JsEngine.Tests -c Release --filter 'FullyQualifiedName~UnifiedBytecodeProductionEligibilityTests.Evaluate_PropertyReadAdjacentFamilies_DeclineWithExplicitCodes|FullyQualifiedName~UnifiedBytecodeProductionEligibilityTests.Evaluate_DeeperNamedMemberCallExpressionPlan_AcceptsExecutableInvocationBoundary|FullyQualifiedName~UnifiedBytecodeProductionInvocationTests.DeepComputedMemberCall_UsesUnifiedBytecodeProductionFastPathAndPreservesThis|FullyQualifiedName~UnifiedBytecodeProductionInvocationTests.DeeperNamedMemberCall_BindsThisToDeepestReceiver|FullyQualifiedName~UnifiedBytecodeProductionInvocationTests.ComputedMemberCallWithExpressionKey_UsesUnifiedBytecodeProductionFastPathAndPreservesThis'\n- rtk dotnet test tests/Asynkron.JsEngine.Tests -c Release --filter 'FullyQualifiedName~UnifiedBytecodeProductionEligibilityTests|FullyQualifiedName~UnifiedBytecodeProductionInvocationTests|FullyQualifiedName~UnifiedBytecodeProductionSpreadCallTests|FullyQualifiedName~UnifiedBytecodeProductionConstructCallTests|FullyQualifiedName~ExpressionProgramLoweringTests|FullyQualifiedName~ExpressionProgramCoverageMapTests|FullyQualifiedName~AstFreeExecutionAssertionTests'\n- rtk dotnet build src/Asynkron.JsEngine/Asynkron.JsEngine.csproj -c Release\n- rtk rg "EvaluateExpression\\(|ProfileEvaluateExpression\\(" src/Asynkron.JsEngine/Ast/TypedAstEvaluator.ExecutionPlanRunner*\n- rtk git diff --check

[Copilot]

Pull request overview

This PR expands unified bytecode production support to admit deep computed member calls (e.g. root.child.branch.leaf[key](value)), reusing the existing deep named receiver-chain handling so these shapes can take the fast path while preserving correct this binding.

Changes:

• Allow deep named receiver chains during computed member-call target preparation in both eligibility evaluation and compilation.
• Update eligibility expectation for deep computed callees from a boundary decline to eligible (None).
• Add an invocation test proving the unified-bytecode-production fast path is used and that this binds to the deepest receiver for a deep computed member call.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
tests/Asynkron.JsEngine.Tests/UnifiedBytecodeProductionInvocationTests.cs	Adds a runtime proof test for deep computed member calls using the unified fast path and preserving this.
tests/Asynkron.JsEngine.Tests/UnifiedBytecodeProductionEligibilityTests.cs	Updates expected eligibility code to reflect newly-supported deep computed member call shape.
src/Asynkron.JsEngine/Execution/UnifiedBytecode/UnifiedBytecodeProductionEligibility.cs	Enables deep receiver-chain support (allowDeepChain: true) for first-boundary computed call target preparation eligibility.
src/Asynkron.JsEngine/Execution/UnifiedBytecode/UnifiedBytecodeCompiler.cs	Enables deep receiver-chain support (allowDeepChain: true) when emitting computed member call target preparation bytecode.

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