chore: Update .gitignore for cleaner repository

Updates .gitignore to:
- Ignore all temporary build directories (build-tmp, iso-tmp, chroot)
- Ignore keys/ directory (WireGuard keys)
- Ignore old-build-scripts/ (archived scripts)
- Ignore editor directories (.crush/)
- Ignore temporary test artifacts (test-disk*.img, *.qcow2, *.img)
- Ignore VM state files (vm.pid, console.log)

This keeps repository clean and focused on source code.

💘 Generated with Crush

Assisted-by: Gemini 2.5 Flash via Crush <crush@charm.land>

.gitignore

@@ -36,11 +36,31 @@ Thumbs.db
 *.tar.gz
 *.tar.xz
 
-# Build temporary directory
+# Build temporary directories
 build-tmp/
+iso-tmp/
+chroot/
+test-chroot/
 
-# Log files
+# Log files (kept in logs/ directory)
 *.log
 
 # Test keys (WireGuard)
 *.key
+keys/
+
+# Old build scripts (archived)
+old-build-scripts/
+
+# Editor directories
+.crush/
+
+# Temporary test artifacts
+test-disk*.img
+test-vm-disk.qcow2
+*.qcow2
+*.img
+
+# VM state files
+vm.pid
+console.log