all: delete the code nothing calls

From the audit (#5178). Each was unreachable from every client:

- Checklist add-item and delete-item: REST POST /items and DELETE /items/<id>,
  the Tauri commands, the store, rest and local adapters, the core's
  add_item/delete_item, set_item_text and remove_item, and the FFI exports.
  Adding, rewording and removing an item are body edits in every editor. The
  checked toggle stays, and its rewriter is simpler without the drop branch.
- Manual unfurl: POST /unfurl and its adapters. Previews arrive in the
  background after a save (unfurl_queue).
- The /api/config `android_client` key, android_release() and the
  APK_NAME/MANIFEST_NAME aliases. Phones poll /api/client/android.
- users.email_verified and users.avatar_path (migration 0037). Nothing set
  the first or read the second; the SMTP reset never checked verification.
- derive::extract_tags (only tests used it; the shared fixture now runs
  through extract_tag_spans), the unused check and link icons, and the
  unused editor_add_item string.
- The blob scheme is renamed tsblob -> inkblob. URLs are built as notes are
  read, so nothing stored carries the old one.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/test_notes.py

@@ -9,14 +9,7 @@ from inkwell.app import create_app
 from inkwell.common import coerce_bool, parse_dt
 from inkwell.colors import NOTE_COLORS
 from inkwell.models.note import Note
-from inkwell.notes.checklist import (
-    append_item,
-    parse_items,
-    remove_item,
-    set_item_checked,
-    set_item_text,
-    strip_marker,
-)
+from inkwell.notes.checklist import append_item, parse_items, set_item_checked, strip_marker
 from inkwell.unfurl_queue import detect_urls
 from inkwell.notes import (
     _ImportBudget,
@@ -58,13 +51,17 @@ def test_all_note_routes_registered(app):
             "snooze_reminder", "export_notes", "import_notes", "list_titles",
             "reorder_notes", "create_note",
             "get_note", "update_note", "list_revisions", "restore_revision",
-            "set_note_labels", "add_item", "update_item", "delete_item",
+            "set_note_labels", "update_item",
             "upload_attachment", "get_attachment",
-            "delete_attachment", "unfurl_link", "delete_preview", "trash_note",
+            "delete_attachment", "delete_preview", "trash_note",
             "restore_note", "delete_note",
         )
     }
     assert expected <= registered, f"unregistered note routes: {expected - registered}"
+    # Removed in #5178: an item is added, reworded and removed by editing the body,
+    # and previews arrive in the background after a save.
+    gone = {"notes.add_item", "notes.delete_item", "notes.unfurl_link"}
+    assert not gone & registered, f"removed note routes are back: {gone & registered}"
 
 
 def test_is_empty_note():
@@ -116,9 +113,9 @@ async def test_search_requires_auth(app):
     assert resp.status_code == 401
 
 
-async def test_add_item_requires_auth(app):
+async def test_update_item_requires_auth(app):
     client = app.test_client()
-    resp = await client.post("/api/notes/00000000-0000-0000-0000-000000000000/items", json={"text": "x"})
+    resp = await client.patch("/api/notes/00000000-0000-0000-0000-000000000000/items/0", json={"checked": True})
     assert resp.status_code == 401
 
 
@@ -583,8 +580,6 @@ def test_uppercase_x_parses_and_normalises_on_rewrite():
 
 def test_rewriters_preserve_indent_bullet_and_neighbours():
     assert set_item_checked("  * [ ] milk", 0, True) == "  * [x] milk"
-    assert set_item_text("- [x] old", 0, "new") == "- [x] new"
-    assert remove_item("keep\n- [ ] drop\n- [ ] stay", 0) == "keep\n- [ ] stay"
     # Addressed by ITEM, not by line.
     assert set_item_checked("note\n- [ ] a\nprose\n- [ ] b", 1, True) == "note\n- [ ] a\nprose\n- [x] b"
 
@@ -594,14 +589,11 @@ def test_a_stale_index_does_nothing():
     # should be inert, not a 500.
     body = "- [ ] only"
     assert set_item_checked(body, 7, True) == body
-    assert remove_item(body, 7) == body
-    assert set_item_text(body, 7, "x") == body
 
 
 def test_a_plain_body_is_returned_unchanged():
     body = "just prose\nwith two lines"
     assert set_item_checked(body, 0, True) == body
-    assert remove_item(body, 0) == body
 
 
 def test_append_item_spacing():