⚡ Bolt: Replace LINQ ToDictionary allocations in ToRoutingContext hot path

[google-labs-jules]

💡 What: Replaced LINQ .ToDictionary(...) calls with a manual CloneDictionary loop inside ToRoutingContext in TemporalNetworkSimulationEngine.cs.

🎯 Why: ToRoutingContext is called heavily within the temporal simulation loop. LINQ's .ToDictionary() allocates enumerators and internal mapping delegates for each execution, leading to rapid garbage generation on this critical hot path. Manually pre-sizing and explicitly iterating eliminates these extraneous heap allocations.

📊 Impact: Reduces GC allocations per batched routing calculation cycle, reducing garbage collection pressure directly on the engine's primary execution pipeline.

🔬 Measurement: Code correctly builds (dotnet build). Formatter has run natively via dotnet format. The test suite confirms performance optimization maintains functionally identical execution (dotnet test).

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PR created automatically by Jules for task 16028878234771903883 started by @wnj00524

[google-labs-jules]

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