fix: skip python-gobject on Arch to avoid PyGObject version conflict

Arch Linux has PyGObject 3.54.5 in python-gobject package, but bluezero
requires PyGObject <3.52.0, causing pip to fail when trying to replace
the system version.

Solution: Don't install python-gobject system package on Arch. Let pip
compile the compatible PyGObject version (3.50.2) instead.

Changes:
- install.sh: Remove python-gobject from Arch pacman install
- install.sh: Add explanatory warning about PyGObject compilation
- tests/test_installer.sh: Don't check for python-gobject on Arch
- tests/test_installer.sh: Add comment explaining why it's skipped
- tests/test_installer.sh: Update summary for Arch (PyGObject compiled)
- README.md: Remove python-gobject from Arch instructions
- README.md: Explain version incompatibility and compilation requirement

Result:
- Debian/Ubuntu: All system packages, zero compilation (~1 min)
- Arch Linux: System packages + PyGObject compilation (~2-3 min)

Trade-off accepted: Arch users get longer install time in exchange for
compatibility with bluezero's PyGObject version requirement.

Fixes: error: uninstall-no-record-file (PyGObject 3.54.5 conflict)

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

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

README.md

@@ -57,17 +57,16 @@ sudo apt-get install python3-pip python3-gi python3-dbus python3-cairo bluez
 
 **Arch Linux:**
 ```bash
-sudo pacman -S base-devel python-pip python-gobject python-dbus python-cairo bluez bluez-utils
+sudo pacman -S base-devel python-pip python-dbus python-cairo bluez bluez-utils
 ```
 
 **Why these packages?**
-- `base-devel`: Build tools (gcc, make, etc.) required for compiling PyGObject from pip
-- `python-gobject`: Python bindings for GObject (system package, but pip may still compile PyGObject)
+- `base-devel`: Build tools (gcc, make, meson) required for compiling PyGObject from pip
 - `python-dbus`: D-Bus Python bindings for BlueZ communication
-- `python-cairo`: Cairo graphics library (PyGObject dependency)
+- `python-cairo`: Cairo graphics library
 - `bluez` / `bluez-utils`: Bluetooth stack and utilities for Linux
 
-**Note for Arch users:** Unlike Debian/Ubuntu where all dependencies use pre-compiled system packages, Arch requires some compilation due to pip/system package integration differences. The bluezero pip package may compile PyGObject from source even when python-gobject is installed.
+**Note for Arch users:** PyGObject is intentionally NOT installed as a system package on Arch due to version incompatibility (Arch has 3.54.5, but bluezero requires <3.52.0). Instead, pip will compile the compatible PyGObject version (3.50.2) during installation. This adds ~2 minutes to installation time but ensures compatibility.
 
 #### 2. Install Python Dependencies
 

install.sh

@@ -226,18 +226,19 @@ if command -v apt-get &> /dev/null; then
 elif command -v pacman &> /dev/null; then
     # Arch Linux
     print_info "Detected Arch Linux"
-    echo "Installing: base-devel python-pip python-gobject python-dbus python-cairo bluez bluez-utils"
-    print_warning "Note: base-devel required for compiling bluezero dependencies (PyGObject from pip)"
+    echo "Installing: base-devel python-pip python-dbus python-cairo bluez bluez-utils"
+    print_warning "Note: PyGObject will be compiled from pip due to version requirements (bluezero needs <3.52.0, Arch has 3.54.5)"
     # Use sudo only if not running as root
     if [ "$EUID" -eq 0 ]; then
         # Sync package database first (may have been synced in basic prereqs, but ensure it's current)
         pacman -Sy --noconfirm
-        pacman -S --needed --noconfirm base-devel python-pip python-gobject python-dbus python-cairo bluez bluez-utils
+        # Skip python-gobject to avoid version conflict - pip will compile PyGObject
+        pacman -S --needed --noconfirm base-devel python-pip python-dbus python-cairo bluez bluez-utils
     else
         sudo pacman -Sy --noconfirm
-        sudo pacman -S --needed --noconfirm base-devel python-pip python-gobject python-dbus python-cairo bluez bluez-utils
+        sudo pacman -S --needed --noconfirm base-devel python-pip python-dbus python-cairo bluez bluez-utils
     fi
-    print_success "System dependencies installed (using pre-compiled system packages where available)"
+    print_success "System dependencies installed (PyGObject will be compiled from pip)"
 else
     print_warning "Could not detect package manager"
     print_info "Please manually install: BlueZ 5.x, python3-dbus"

tests/test_installer.sh

@@ -74,8 +74,8 @@ if [ "$OS_TYPE" = "debian" ]; then
     check_package bluez
     echo "  ✓ bluez installed"
 elif [ "$OS_TYPE" = "arch" ]; then
-    check_package python-gobject
-    echo "  ✓ python-gobject installed"
+    # Note: python-gobject NOT installed on Arch to avoid version conflict
+    # PyGObject compiled from pip instead
     check_package python-dbus
     echo "  ✓ python-dbus installed"
     check_package python-cairo
@@ -163,10 +163,11 @@ if [ "$OS_TYPE" = "debian" ]; then
     echo "  • System packages: python3, python3-pip, git, python3-gi, python3-dbus, python3-cairo, bluez"
     echo "  • Pip packages: rns, bleak, bluezero"
     echo "  • Install method: System packages (no compilation)"
+    echo "  • Installation time: < 1 minute"
 elif [ "$OS_TYPE" = "arch" ]; then
-    echo "  • System packages: python, python-pip, git, python-gobject, python-dbus, python-cairo, bluez, bluez-utils, base-devel"
-    echo "  • Pip packages: rns, bleak, bluezero (PyGObject compiled during bluezero install)"
-    echo "  • Install method: System packages + compilation (base-devel provides build tools)"
+    echo "  • System packages: python, python-pip, git, python-dbus, python-cairo, bluez, bluez-utils, base-devel"
+    echo "  • Pip packages: rns, bleak, bluezero, PyGObject (compiled)"
+    echo "  • Install method: System packages + PyGObject compilation (version compatibility)"
+    echo "  • Installation time: ~2-3 minutes (PyGObject compilation)"
 fi
-echo "  • Installation time: Fast (< 2 minutes on Debian/Ubuntu, ~3 minutes on Arch)"
 echo ""