[Feature Request] Track multiple degraded counts

> When they do, the capacity of the pouch is reduced by a few essence (3 for the medium pouch, 2 for the large pouch, 3 for the giant pouch, and 5 for the colossal pouch)

Reflect degradation state on the stored essence count. Currently, if a pouch degrades again and user stores essence, the plugin state could be invalid an a user will have to recheck their pouch.

Potential work-around until this is implemented: Listen for a degradation and flag the stored essence count on the pouch as `unknownStored`

No files or tests are named in the issue. Start by tracing pouch degradation handling and the stored essence state, then determine how repeated degradation should update the count or mark it as unknownStored. Done means the plugin remains consistent after degradation followed by storing essence, without requiring a manual pouch recheck.

Written by the indexing model from the issue text.