Initial project setup: automated PXE server provisioning

Reorganized from OneDrive export into a clean project structure:
- autoinstall/: cloud-init user-data and meta-data for Ubuntu 24.04 autoinstall
- playbook/: Ansible playbook for PXE server config (dnsmasq, Apache, Samba, iPXE)
- unattend/: Windows unattend.xml sample for image deployment
- build-usb.sh: builds a bootable USB with Ubuntu installer + CIDATA partition
- download-packages.sh: downloads all offline .deb dependencies via Docker

Key improvements over original:
- Fully air-gapped: all packages bundled offline, no WiFi needed
- Hardware-agnostic network config (wildcard NIC matching)
- Removed plaintext WiFi credentials
- Single USB build process (was 15+ manual steps)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,30 @@
+# Large binary files — download/build these, don't commit them
+*.deb
+*.zip
+*.wim
+*.iso
+*.efi
+*.sdi
+
+# OneDrive download artifacts
+OneDrive_*/
+
+# Error folders from OneDrive download
+__*/
+___*.txt
+
+# Original OneDrive folder structure (reorganized into autoinstall/ and playbook/)
+WestJeff*/
+
+# Duplicate at root (canonical copy in unattend/)
+/FlatUnattendW10.xml
+
+# Offline packages (built by download-packages.sh)
+offline-packages/
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Secrets
+secrets.md