081ed10a8b
- Fix LocalX2Apic handler: use local_apic.x2 to select correct ICR format (<<32 for x2APIC, <<56 for xAPIC) instead of hardcoded <<32 - Promote x2APIC/xAPIC detection from debug! to info! for bootlog - Document build system durability in AGENTS.md: cardinal rule, two-layer architecture, correct workflow, anti-patterns