feat: sync with upstream — v1.2.0, in-app updates, Projects, modules

Brings the public tree back in line with the development repo after several
weeks of drift caused by a stale publish include list.

New:
- In-app update path: GET /update/check compares the checkout against
  origin/main and POST /update/apply runs `ncp upgrade` detached (pull,
  rebuild, restart). The sidebar shows the version, checks on click, and
  offers an "update available" pill.
- Projects: a project workspace groups chats and RAG documents, with
  per-project instructions and document retrieval scoped to the active
  project. Replaces the standalone Documents page.
- modules/: auto-discovered feature plugins (mail, network) with their
  frontend counterparts and tests.
- Memory curation runs in-process (synapse/memory/curator.py) on the chat
  model when a conversation goes idle. The separate memory service on :8001
  is gone, along with the launcher lines that started it.

Also: the KDE theme, panel and Promethean terminal assets, the full test
suite, and VERSION 1.2.0.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

assets/themes/restore-snapshot/xfconf-xml/xfce4-panel.xml

@@ -1,4 +1,4 @@
-<?xml version="1.1" encoding="UTF-8"?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <channel name="xfce4-panel" version="1.0">
   <property name="configver" type="int" value="2"/>
@@ -38,7 +38,14 @@
     <property name="dark-mode" type="bool" value="true"/>
   </property>
   <property name="plugins" type="empty">
+    <property name="plugin-1" type="empty"/>
     <property name="plugin-2" type="string" value="power-manager-plugin"/>
+    <property name="plugin-3" type="empty">
+      <property name="items" type="empty"/>
+    </property>
+    <property name="plugin-4" type="empty">
+      <property name="items" type="empty"/>
+    </property>
     <property name="plugin-5" type="string" value="separator">
       <property name="items" type="array">
         <value type="string" value="17640946043.desktop"/>
@@ -81,15 +88,11 @@
       </property>
       <property name="button-icon" type="string" value="/home/jon/nexus-core/assets/n-small.png"/>
       <property name="recent" type="array">
+        <value type="string" value="microsoft-edge.desktop"/>
         <value type="string" value="xfce4-taskmanager.desktop"/>
-        <value type="string" value="virtualbox.desktop"/>
-        <value type="string" value="virt-manager.desktop"/>
         <value type="string" value="org.gnome.DiskUtility.desktop"/>
         <value type="string" value="org.x.editor.desktop"/>
         <value type="string" value="promethean-terminal.desktop"/>
-        <value type="string" value="claude-usage-widget.desktop"/>
-        <value type="string" value="kitty.desktop"/>
-        <value type="string" value="putty.desktop"/>
         <value type="string" value="code.desktop"/>
       </property>
       <property name="view-mode" type="int" value="2"/>
@@ -107,6 +110,7 @@
       <property name="show-notifications" type="bool" value="true"/>
       <property name="known-players" type="string" value="Microsoft Edge"/>
     </property>
+    <property name="plugin-9" type="empty"/>
     <property name="plugin-10" type="string" value="notification-plugin"/>
     <property name="plugin-11" type="empty"/>
     <property name="plugin-12" type="string" value="clock">
@@ -118,8 +122,13 @@
       <property name="digital-date-format" type="string" value="%m/%d/%Y"/>
       <property name="digital-date-font" type="string" value="Sans 8"/>
     </property>
+    <property name="plugin-13" type="string" value="genmon">
+      <property name="digital-time-format" type="empty"/>
+      <property name="digital-layout" type="empty"/>
+      <property name="digital-date-font" type="empty"/>
+      <property name="digital-time-font" type="empty"/>
+    </property>
     <property name="plugin-14" type="empty"/>
-    <property name="plugin-13" type="string" value="genmon"/>
     <property name="plugin-15" type="string" value="genmon"/>
     <property name="plugin-16" type="string" value="genmon"/>
   </property>