/write delete_tag returns success but leaves the tag on items

[dzackgarza]

Observed against the live local add-on on 2026-03-11.

Repro:

• Installed add-on reports GET http://127.0.0.1:23119/version -> version: 3.2.0
• Add two real tags to an existing item, e.g. raw-delete-tag-bf720091 and raw-keep-tag-30cc439f
• POST directly to http://127.0.0.1:23119/write with:

  {
    "operation": "delete_tag",
    "tag_name": "raw-delete-tag-bf720091"
  }

Observed result:

• HTTP 200
• Body:

  {
    "success": true,
    "operation": "delete_tag",
    "stage": "completed",
    "version": "3.2.0",
    "details": {
      "tag_name": "raw-delete-tag-bf720091"
    }
  }

• Immediate read-back of the same item still shows both tags present:

  ['raw-delete-tag-bf720091', 'raw-keep-tag-30cc439f']
  

Expected:

• delete_tag should remove the named tag from all matching items, or return a failure if the operation did not actually take effect.

Likely suspect:

• handleDeleteTag() currently calls Zotero.Tags.removeFromLibrary(...). The endpoint reports success, but the tag remains present on item read-back.