ae46dabeb0
Replace 5 stale planning docs with unified assessment: - New: COMPREHENSIVE-SYSTEM-ASSESSMENT-AND-IMPROVEMENT-PLAN.md (12-subsystem audit vs Linux 7.1, 6 phases of work) - Removed: IMPLEMENTATION-MASTER-PLAN, SUBSYSTEM-ASSESSMENT-2026-05, SMP-BOOT-HARDENING-PLAN, CPU-DMA-IRQ-MSI-SCHEDULER-FIX-PLAN, COMPREHENSIVE-BOOT-IMPROVEMENT-PLAN