📝 Scribe: Add XML documentation for FreeCompanyChest

[nt153133]

💡 What: Added comprehensive XML documentation for the Free Company chest module, covering the remote agent (AgentFreeCompanyChest.cs), the UI window (FreeCompanyChest.cs), and the permission model (CompanyChestPermission.cs).

🎯 Why: The Free Company chest logic involves non-obvious bit-packing for permissions and a specific synchronization pattern for loading inventory data. This documentation "illuminates" these areas for better maintainability.

🔬 Examples:

• Bit-packing clarity: Added <remarks> to ItemTabPermissions explaining how 2-bit values are extracted from a 32-bit field.
• Async logic: Documented the LoadBag method and its interaction with the FullyLoaded memory flag.
• Domain alignment: Defined the four access levels in CompanyChestPermission to match in-game behavior.

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PR created automatically by Jules for task 4574473559433748807 started by @nt153133

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