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>

launch_nexus.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+PROJECT_ROOT="$(cd "$(dirname "$0")" && pwd)"
+PYTHON="$PROJECT_ROOT/Promethean/bin/python3"
+FRONTEND_DIR="$PROJECT_ROOT/interface/web"
+LOG_DIR="$PROJECT_ROOT/runtime"
+
+mkdir -p "$LOG_DIR"
+
+MEMORY_LOG="$LOG_DIR/memory.log"
+BACKEND_LOG="$LOG_DIR/backend.log"
+FRONTEND_LOG="$LOG_DIR/frontend.log"
+
+_start() {
+    # _start <label> <log_file> <work_dir> <cmd> [args...]
+    local label="$1" log_file="$2" work_dir="$3"
+    shift 3
+    : > "$log_file"
+    ( cd "$work_dir" && exec "$@" ) >> "$log_file" 2>&1 &
+    echo $!
+}
+
+_check() {
+    local label="$1" pid="$2" log_file="$3"
+    if kill -0 "$pid" 2>/dev/null; then
+        echo "$label STARTED"
+    else
+        echo "$label FAILED TO START"
+        [ -s "$log_file" ] && tail -8 "$log_file" | sed 's/^/  /'
+    fi
+}
+
+# Launch memory + backend together
+MEMORY_PID=$(_start "NEXUS MEMORY SERVICE" "$MEMORY_LOG" "$PROJECT_ROOT" \
+    "$PYTHON" -m uvicorn synapse.memory.service:app --host 0.0.0.0 --port 8001 --reload)
+
+BACKEND_PID=$(_start "NEXUS BACKEND SERVICE" "$BACKEND_LOG" "$PROJECT_ROOT" \
+    "$PYTHON" -m uvicorn synapse.main:sio_app --host 0.0.0.0 --port 8000 --reload)
+
+sleep 3
+_check "NEXUS MEMORY SERVICE" "$MEMORY_PID" "$MEMORY_LOG"
+_check "NEXUS BACKEND SERVICE" "$BACKEND_PID" "$BACKEND_LOG"
+
+# Frontend last
+FRONTEND_PID=$(_start "NEXUS FRONTEND SERVICE" "$FRONTEND_LOG" "$FRONTEND_DIR" \
+    npm run dev)
+
+sleep 5
+_check "NEXUS FRONTEND SERVICE" "$FRONTEND_PID" "$FRONTEND_LOG"
+
+trap "kill $MEMORY_PID $BACKEND_PID $FRONTEND_PID 2>/dev/null; echo ''; echo 'NEXUS STOPPED'; exit" SIGINT SIGTERM
+wait