Initial commit: NexusOS project + desktop theme baseline

Captures the known-good state after theme consolidation and
consistency reconciliation:
- NexusOS GTK/xfwm4/icon theme assets (assets/themes, management/Mint-Y-Nexus)
- Tightened right-click menus, visible separators, no menu icons
- assets/themes/install-theme.sh: idempotent restore of all wiring
  (symlinks, xfconf xsettings+xfwm4, GTK 3/4 settings.ini)
- .gitignore excludes venv/ollama/models/runtime/db

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

bin/restore-full.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+
+NEXUS_ROOT="$HOME/nexus-core"
+
+detect_requirements() {
+    if command -v nvidia-smi &>/dev/null || lspci 2>/dev/null | grep -qi nvidia; then
+        echo "nvidia_requirements.txt"
+    else
+        echo "amd_requirements.txt"
+    fi
+}
+
+echo "Restoring full Nexus backup from router..."
+lftp sftp://router:2022 << 'LFTP'
+set sftp:connect-program "ssh -a -x -p 2022"
+set cmd:interactive yes
+mirror --delete --verbose --dereference --exclude "^Promethean/" --exclude "^models/blobs/" --exclude "^ollama/" --exclude "^interface/web/node_modules/" --exclude "^interface/web/dist/" --exclude "^runtime/" --exclude "__pycache__" --exclude "\.pyc$" /Wingdrive2/nexus-backup /home/jon/nexus-core
+quit
+LFTP
+
+echo ""
+echo "Rebuilding Python environment..."
+req=$(detect_requirements)
+if [ -f "$NEXUS_ROOT/$req" ]; then
+    "$NEXUS_ROOT/Promethean/bin/pip" install -r "$NEXUS_ROOT/$req"
+else
+    echo "Warning: $req not found — skipping pip install."
+fi
+
+echo ""
+echo "Rebuilding frontend dependencies..."
+cd "$NEXUS_ROOT/interface/web" && npm install
+
+echo ""
+echo "Restore complete. Nexus is ready to start."