📝 Scribe: Add XML documentation for Utilities.Inventory

[nt153133]

💡 What: Added XML documentation to the Inventory utility class, its properties (IsBusy, InventoryBagIds, ArmoryBagIds), and its asynchronous task methods (CofferTask, UseUnlockablesAsync, Desynth, ReduceAll, and ExtractFromAllGear).

🎯 Why: This area is a high-traffic utility hub used for various automated inventory tasks (opening coffers, using unlockables, desynthesizing, etc.), but it lacked detailed documentation for its public surface area and internal logic (e.g., job/level requirements for desynth).

🔬 Examples:

• Documented IsBusy with detailed remarks on the player states that define being "busy".
• Documented ExtractFromAllGear noting the specific exclusion of Relic Sphere Scrolls.
• Documented Desynth overloads detailing level 30+ and job requirements.

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PR created automatically by Jules for task 4648690000873664739 started by @nt153133

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