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>

audit/internal/tui/screen_health_check.go

@@ -33,6 +33,9 @@ const (
 // hcModeDurations maps mode index (0=Quick,1=Standard,2=Express) to GPU stress seconds.
 var hcModeDurations = [3]int{600, 3600, 28800}
 
+// hcCPUDurations maps mode index to CPU stress-ng seconds.
+var hcCPUDurations = [3]int{60, 300, 900}
+
 func (m model) enterHealthCheck() (tea.Model, tea.Cmd) {
 	m.screen = screenHealthCheck
 	if !m.hcInitialized {
@@ -126,12 +129,10 @@ func (m model) hcRunSingle(idx int) (tea.Model, tea.Cmd) {
 		m.cursor = 0
 		return m, nil
 	case hcCPU:
-		m.busy = true
-		m.busyTitle = "CPU"
-		return m, func() tea.Msg {
-			r := m.app.ComponentDetailResult("CPU")
-			return resultMsg{title: r.Title, body: r.Body, back: screenHealthCheck}
-		}
+		m.pendingAction = actionRunCPUSAT
+		m.screen = screenConfirm
+		m.cursor = 0
+		return m, nil
 	}
 	return m, nil
 }
@@ -150,6 +151,7 @@ func (m model) hcRunAll() (tea.Model, tea.Cmd) {
 
 func (m model) executeRunAll() (tea.Model, tea.Cmd) {
 	durationSec := hcModeDurations[m.hcMode]
+	durationIdx := m.hcMode
 	sel := m.hcSel
 	app := m.app
 	m.busy = true
@@ -197,8 +199,13 @@ func (m model) executeRunAll() (tea.Model, tea.Cmd) {
 			parts = append(parts, "=== STORAGE ===\n"+body)
 		}
 		if sel[hcCPU] {
-			r := app.ComponentDetailResult("CPU")
-			parts = append(parts, "=== CPU ===\n"+r.Body)
+			cpuDur := hcCPUDurations[durationIdx]
+			r, err := app.RunCPUAcceptancePackResult("", cpuDur)
+			body := r.Body
+			if err != nil {
+				body += "\nERROR: " + err.Error()
+			}
+			parts = append(parts, "=== CPU ===\n"+body)
 		}
 		combined := strings.Join(parts, "\n\n")
 		if combined == "" {