feat(tui): NVIDIA SAT with nvtop, GPU selection, metrics and chart — v1.0.0

- TUI: duration presets (10m/1h/8h/24h), GPU multi-select checkboxes
- nvtop launched concurrently with SAT via tea.ExecProcess; can reopen or abort
- GPU metrics collected per-second during bee-gpu-stress (temp/usage/power/clock)
- Outputs: gpu-metrics.csv, gpu-metrics.html (offline SVG), gpu-metrics-term.txt
- Terminal chart: asciigraph-style line chart with box-drawing chars and ANSI colours
- AUDIT_VERSION bumped 0.1.1 → 1.0.0; nvtop added to ISO package list
- runtime-flows.md updated with full NVIDIA SAT TUI flow documentation

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

audit/internal/tui/update.go

@@ -87,6 +87,33 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	case bannerMsg:
 		m.banner = strings.TrimSpace(msg.text)
 		return m, nil
+	case nvidiaGPUsMsg:
+		return m.handleNvidiaGPUsMsg(msg)
+	case nvtopClosedMsg:
+		// nvtop closed — stay on running screen (or result if SAT is already done)
+		return m, nil
+	case nvidiaSATDoneMsg:
+		if m.nvidiaSATAborted {
+			return m, nil
+		}
+		if m.nvidiaSATCancel != nil {
+			m.nvidiaSATCancel()
+			m.nvidiaSATCancel = nil
+		}
+		m.prevScreen = screenAcceptance
+		m.screen = screenOutput
+		m.title = msg.title
+		if msg.err != nil {
+			body := strings.TrimSpace(msg.body)
+			if body == "" {
+				m.body = fmt.Sprintf("ERROR: %v", msg.err)
+			} else {
+				m.body = fmt.Sprintf("%s\n\nERROR: %v", body, msg.err)
+			}
+		} else {
+			m.body = msg.body
+		}
+		return m, nil
 	}
 
 	return m, nil
@@ -104,6 +131,10 @@ func (m model) updateKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 		return m.updateMenu(msg, len(m.serviceMenu), m.handleServiceActionMenu)
 	case screenAcceptance:
 		return m.updateMenu(msg, 4, m.handleAcceptanceMenu)
+	case screenNvidiaSATSetup:
+		return m.updateNvidiaSATSetup(msg)
+	case screenNvidiaSATRunning:
+		return m.updateNvidiaSATRunning(msg)
 	case screenExportTargets:
 		return m.updateMenu(msg, len(m.targets), m.handleExportTargetsMenu)
 	case screenInterfacePick: