fix(inventory): address review feedback on area path counts

[MrHinsh]

Summary

Follow-up to #123 addressing CodeRabbit and Codex review feedback.

• Case-sensitive comparer: AreaPathCounts now uses the default case-sensitive comparer — Azure DevOps area paths are case-sensitive and OrdinalIgnoreCase would silently merge distinct paths
• Resume fix: inventory-areapath.csv is now reloaded on resume so previously-collected rows are not overwritten when an interrupted inventory run is retried
• Unused import: Removed using System.Collections.ObjectModel from InventoryReport.cs

Note: the GetValueOrDefault nitpick was not applied — the TFS Object Model project targets net481 where that method is unavailable; TryGetValue is kept there.

Test plan

• All 1022 tests passing (dotnet test)
• Full solution builds with 0 errors

🤖 Generated with Claude Code

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: ed01c9fe-a400-4624-a4ab-d383b0ff6aa6

📥 Commits

Reviewing files that changed from the base of the PR and between e73c4a7 and 79d63b1.

📒 Files selected for processing (3)

• src/DevOpsMigrationPlatform.Abstractions.Agent/Discovery/ProjectDiscoverySummary.cs
• src/DevOpsMigrationPlatform.Abstractions/ControlPlaneApi/InventoryReport.cs
• src/DevOpsMigrationPlatform.Infrastructure.Agent/Discovery/InventoryOrchestrator.cs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/inventory-area-path-review-feedback

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