⚡ Bolt: [Optimize economic metric aggregation and actor mapping]

[google-labs-jules]

💡 What: Replaced heavy LINQ query pipelines (.SelectMany().Distinct().GroupBy().ToDictionary()) in WorkspacePresentation.cs for building economic metrics and actor mapping with manual nested foreach loops and pre-sized dictionaries. Consolidated nine redundant LINQ lookups over SimulationActors into a single loop pass.

🎯 Why: To eliminate massive garbage collection overhead. Every time the simulation ran or advanced the timeline, CreateEconomicMetrics triggered multiple $O(N)$ allocations for delegates, closures, and intermediate dictionary/list creation.

📊 Impact: Significantly reduces CPU overhead and GC stutters in the UI thread after simulation runs. Reduces metric generation time complexity from effectively $O(k \times N)$ to strictly $O(N)$, avoiding dozens of hidden object instantiations per update.

🔬 Measurement: Verified that the project successfully compiles, all 131 tests in MedWNetworkSim.Tests pass, and identical behavior is preserved as missing keys are handled precisely with .TryGetValue() and standard checks.

---

PR created automatically by Jules for task 10359839038832684737 started by @wnj00524

[google-labs-jules]

👋 Jules, reporting for duty! I'm here to lend a hand with this pull request.

When you start a review, I'll add a 👀 emoji to each comment to let you know I've read it. I'll focus on feedback directed at me and will do my best to stay out of conversations between you and other bots or reviewers to keep the noise down.

I'll push a commit with your requested changes shortly after. Please note there might be a delay between these steps, but rest assured I'm on the job!

For more direct control, you can switch me to Reactive Mode. When this mode is on, I will only act on comments where you specifically mention me with @jules. You can find this option in the Pull Request section of your global Jules UI settings. You can always switch back!

New to Jules? Learn more at jules.google/docs.

---

For security, I will only act on instructions from the user who triggered this task.