feat(18.1-01): task 1 taglist field in array mode end to end

- cabana: core type taglist (mode string|array, separator, customTags,
  options as a list of tags), column type gate, save-time normalisation
  (trim, drop empties, dedupe) and taglist.invalid 422, record hydration
- FormField gains separator and customTags (omitempty); OpenAPI and
  schema.d.ts regenerated
- admin: TaglistField chip input with suggestions, registry entry, vitest
- acme.catalog fixture with TestTaglistFieldCompile and TestTaglistFieldSmoke
- docs: forms.md Taglist section, cabana README; rebuilt dist

admin/src/api/schema.d.ts

@@ -5608,6 +5608,11 @@ export interface components {
              *     money field's currency code; the admin follows that field's value.
              */
             currencyFrom?: string;
+            /**
+             * @description CustomTags is a taglist field's customTags as fields.yaml declares it;
+             *     nil means the default, true. With false only the options are accepted.
+             */
+            customTags?: boolean;
             default?: components["schemas"]["cabana.jsonScalar"];
             /**
              * @description Deferrable is true on a relation-manager field whose relation can be
@@ -5675,8 +5680,9 @@ export interface components {
             minItems?: number;
             /**
              * @description Mode is the fileupload mode (image or file, default file), the
-             *     datepicker mode (date, datetime or time, default datetime) or the
-             *     permissioneditor mode (radio or checkbox).
+             *     datepicker mode (date, datetime or time, default datetime), the
+             *     permissioneditor mode (radio or checkbox) or the taglist mode (string,
+             *     the default, or array).
              */
             mode?: string;
             multiple?: boolean;
@@ -5716,6 +5722,11 @@ export interface components {
              *     (default 4). A value with more digits is refused, never rounded.
              */
             scale?: number;
+            /**
+             * @description Separator joins the tags of a `type: taglist` field in string mode:
+             *     comma (the default) or space. Empty in array mode.
+             */
+            separator?: string;
             size?: string;
             span?: string;
             tab?: string;