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/screen_acceptance.go

@@ -10,7 +10,7 @@ func (m model) handleAcceptanceMenu() (tea.Model, tea.Cmd) {
 	}
 	switch m.cursor {
 	case 0:
-		m.pendingAction = actionRunNvidiaSAT
+		return m.enterNvidiaSATSetup()
 	case 1:
 		m.pendingAction = actionRunMemorySAT
 	case 2: