fix: hide unused wp_note CPT from admin UI to stop "Add New Note" misroute

The plugin registered a wp_note CPT with show_ui=true and show_in_menu=
'wp-notes', which caused WordPress to auto-inject "All Notes" and
"Add New" submenus under the WP Notes admin menu. The "Add New"
submenu routed to post-new.php?post_type=wp_note — the standard WP
post editor — but the live plugin stores notes in wp_options
(get_option('wp_notes')), not as CPT posts. Anyone clicking that
submenu ended up writing to the wrong storage and their note never
appeared in the WP Notes list.

Fix: show_ui and show_in_menu set to false on the wp_note CPT, and
show_ui / show_admin_column / show_in_rest set to false on the
wp_note_category taxonomy. The CPT/taxonomy remain registered so the
wp_notes_migrate_to_cpt() helper can still call wp_insert_post() —
just no admin UI side-effects until the migration is completed and
the live storage swaps over.

Also adds CHANGELOG.md in Keep-a-Changelog format with the
[Unreleased] entry for this fix and a 3.0.2 baseline note for the
"trimmed from v1.1.5 feature-creep" lineage.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

wp-notes.php

@@ -1513,14 +1513,20 @@ function wp_notes_register_cpt() {
     $args = array(
         'labels'              => $labels,
         'public'              => false,
-        'show_ui'            => true,
-        'show_in_menu'       => 'wp-notes',
+        // show_ui=false: the live UI stores notes in wp_options, not as
+        // CPT posts. show_ui=true caused WordPress to auto-inject "All
+        // Notes" and "Add New" submenus that pointed at post-new.php and
+        // routed users into the standard post editor — which writes to
+        // the wrong storage. The CPT remains registered so the
+        // wp_notes_migrate_to_cpt() helper can still use wp_insert_post.
+        'show_ui'            => false,
+        'show_in_menu'       => false,
         'capability_type'    => 'post',
         'hierarchical'       => false,
         'supports'           => array('title', 'editor', 'author', 'custom-fields'),
         'has_archive'        => false,
         'menu_position'      => null,
-        'show_in_rest'       => true,
+        'show_in_rest'       => false,
     );
 
     register_post_type('wp_note', $args);
@@ -1543,10 +1549,13 @@ function wp_notes_register_cpt() {
     register_taxonomy('wp_note_category', 'wp_note', array(
         'hierarchical'      => true,
         'labels'            => $tax_labels,
-        'show_ui'           => true,
-        'show_admin_column' => true,
+        // Hidden alongside the parent CPT — live UI doesn't surface
+        // categories yet, and showing the taxonomy in admin with the
+        // parent hidden would just dead-link.
+        'show_ui'           => false,
+        'show_admin_column' => false,
         'query_var'         => true,
-        'show_in_rest'      => true,
+        'show_in_rest'      => false,
     ));
 }
 add_action('init', 'wp_notes_register_cpt');