fix: restore user-mode libvirt (no sudo) and fix preseed partitioning

Two critical fixes in this commit:

1. VM Creation Regression (13139f2):
   - Restored qemu:///session (user mode) from qemu:///system (root mode)
   - Changed storage paths from /var/lib/libvirt/images to ~/.local/share/libvirt/images
   - Removed all sudo calls from vm_create and vm_destroy functions
   - Updated test to expect session URI

2. Preseed Partitioning Fix:
   - Added GPT partition table directives
   - Added LVM confirmation settings
   - Fixed EFI partition syntax per Debian official example
   - Fixed /boot max size from 512 to 1024
   - KEY FIX: Added 'partman-auto/choose_recipe select efi-boot-root'

Additional changes:
- Added LICENSE file (GNU AGPL v3.0 only)
- Updated AGENTS.md to enforce auto-commit/push behavior

💘 Generated with Crush

Assisted-by: GLM-4.7 via Crush <crush@charm.land>

tests/unit/run_comprehensive_test.bats

@@ -253,8 +253,8 @@
     grep -q 'VM_DISK_SIZE=' /workspace/run.sh
 }
 
-@test "run.sh uses system libvirt URI" {
-    grep -q 'qemu:///system' /workspace/run.sh
+@test "run.sh uses session libvirt URI (no root required)" {
+    grep -q 'qemu:///session' /workspace/run.sh
 }
 
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