feat: CPU SAT via stress-ng + BMC version via ipmitool

BMC:
- collector/board.go: collectBMCFirmware() via ipmitool mc info, graceful skip if /dev/ipmi0 absent
- collector/collector.go: append BMC firmware record to snap.Firmware
- app/panel.go: show BMC version in TUI right-panel header alongside BIOS

CPU SAT:
- platform/sat.go: RunCPUAcceptancePack(baseDir, durationSec) — lscpu + sensors before/after + stress-ng
- app/app.go: RunCPUAcceptancePack + RunCPUAcceptancePackResult methods, satRunner interface updated
- app/panel.go: CPU row now reads real PASS/FAIL from cpu-*/summary.txt via satStatuses(); cpuDetailResult shows last SAT summary + audit data
- tui/types.go: actionRunCPUSAT, confirmBody for CPU test with mode label
- tui/screen_health_check.go: hcCPUDurations [60,300,900]s; hcRunSingle(CPU)→confirm screen; executeRunAll uses RunCPUAcceptancePackResult
- tui/forms.go: actionRunCPUSAT → RunCPUAcceptancePackResult with mode duration
- cmd/bee/main.go: bee sat cpu [--duration N] subcommand

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

bible-local/backlog.md

@@ -2,7 +2,7 @@
 
 ## BMC версия через IPMI
 
-**Статус:** не реализовано.
+**Статус:** реализовано.
 
 Добавить сбор версии BMC firmware в board collector:
 - Команда: `ipmitool mc info` → поле `Firmware Revision`
@@ -12,7 +12,7 @@
 
 ## CPU acceptance test через stress-ng
 
-**Статус:** не реализовано. CPU в Health Check всегда `N/A`.
+**Статус:** реализовано. CPU в Health Check получает PASS/FAIL из summary.txt.
 
 Добавить CPU SAT на базе `stress-ng`:
 - Bake `stress-ng` в ISO (добавить в `bee.list.chroot`)