fix(deploy): refine install.sh variables, pip upgrade, permissions, and active defaults based on review

deploy/install.sh

@@ -30,11 +30,12 @@ check_cmd() {
 
 check_cmd tmux
 check_cmd python3
-check_cmd pip3
 
 # Verify Python Version
 PYTHON_VERSION=$(python3 -c 'import sys; print(f"{sys.version_info.major}.{sys.version_info.minor}")')
-if python3 -c "import sys; exit(0 if sys.version_info >= (3, 9) else 1)"; then
+PYTHON_MAJOR="${MIN_PYTHON_VERSION%%.*}"
+PYTHON_MINOR="${MIN_PYTHON_VERSION##*.}"
+if python3 -c "import sys; exit(0 if sys.version_info >= ($PYTHON_MAJOR, $PYTHON_MINOR) else 1)"; then
   echo "✅ Python $PYTHON_VERSION detected."
 else
   echo "❌ Error: Python version must be $MIN_PYTHON_VERSION or higher. Detected: $PYTHON_VERSION" >&2
@@ -46,8 +47,10 @@ cd "$TARGET_DIR"
 echo "📂 Ensuring metadata directory structure (.mam/)..."
 mkdir -p .mam/jobs .mam/delegate_job_logs
 
-# File permission lockdown on database directory
-chmod 0700 .mam
+# File permission lockdown on database directory (if owned by the current user to prevent multi-user system issues)
+if [ -O .mam ]; then
+  chmod 0700 .mam
+fi
 
 # --- 3. Check Network File System (NFS) Warnings ---
 echo "💾 Detecting file system mount type..."
@@ -77,17 +80,18 @@ fi
 # shellcheck disable=SC1091
 source "$VENV_NAME"/bin/activate
 
+# Upgrade pip
+pip install --upgrade pip
+
 # Install requirements
 REQ_FILE=".agents/skills/multi-agent-mux-delegate-job/requirements.txt"
 if [ -f "$REQ_FILE" ]; then
   echo "📦 Installing backplane dependencies from $REQ_FILE..."
-  pip install --upgrade pip
   pip install -r "$REQ_FILE"
   echo "✅ Dependencies installed successfully."
 else
   echo "⚠️  WARNING: Could not find requirements file: $REQ_FILE"
   echo "   Installing default packages (paho-mqtt, pyyaml) manually..."
-  pip install --upgrade pip
   pip install "paho-mqtt>=2.0.0" pyyaml
 fi
 
@@ -98,13 +102,15 @@ if [ ! -f "$ENV_FILE" ]; then
   if [ -f "$ENV_EXAMPLE" ]; then
     echo "📝 Creating configuration from $ENV_EXAMPLE..."
     cp "$ENV_EXAMPLE" "$ENV_FILE"
-    chmod 0600 "$ENV_FILE"
   else
     echo "📝 Creating default $ENV_FILE..."
-    cat <<EOF > "$ENV_FILE"
-# ==============================================================================
-# Multi-Agent Mux (MAM) Environment Settings
-# ==============================================================================
+    touch "$ENV_FILE"
+  fi
+  
+  # Always append the active defaults to ensure they are set and not commented out
+  cat <<EOF >> "$ENV_FILE"
+
+# === Installer-applied active defaults ===
 MQTT_BROKER=broker.hivemq.com
 MQTT_PORT=1883
 MQTT_TLS=0
@@ -112,7 +118,6 @@ MQTT_CLIENT_ID_PREFIX=mam-agent
 TMUX_SERVER_NAME=default
 EOF
   chmod 0600 "$ENV_FILE"
-  fi
   echo "✅ Config file .env initialized with chmod 0600."
 else
   echo "ℹ️  $ENV_FILE already exists. Skipping config override."