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feat: universal boot — one USB image works on both Macs and ThinkPads master

Oven build now produces vmlinuz-slim (no embedded initramfs) + separate initramfs.cpio.gz alongside the full vmlinuz. Flash script auto-detects: if slim kernel exists, uses splash → systemd-boot → slim kernel chain (works on Mac EFI). Otherwise falls back to chainloader (ThinkPad). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>