feat(tui): rebuild TUI around hardware diagnostics (Health Check + two-column layout)

- Replace 12-item flat menu with 4-item main menu: Health Check, Export support bundle, Settings, Exit
- Add Health Check screen (Lenovo-style): per-component checkboxes (GPU/MEM/DISK/CPU), Quick/Standard/Express modes, Run All, letter hotkeys G/M/S/C/R/A/1/2/3
- Add two-column main screen: left = menu, right = hardware panel with colored PASS/FAIL/CANCEL/N/A status per component; Tab/→ switches focus, Enter opens component detail
- Add app.LoadHardwarePanel() + ComponentDetailResult() reading audit JSON and SAT summary.txt files
- Move Network/Services/audit actions into Settings submenu
- Export: support bundle only (remove separate audit JSON export)
- Delete screen_acceptance.go; add screen_health_check.go, screen_settings.go, app/panel.go
- Add BMC + CPU stress-ng tests to backlog
- Update bible submodule
- Rewrite tui_test.go for new screen/action structure

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

audit/internal/tui/update.go

@@ -11,12 +11,10 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 	switch msg := msg.(type) {
 	case tea.KeyMsg:
 		if m.busy {
-			switch msg.String() {
-			case "ctrl+c":
+			if msg.String() == "ctrl+c" {
 				return m, tea.Quit
-			default:
-				return m, nil
 			}
+			return m, nil
 		}
 		return m.updateKey(msg)
 	case resultMsg:
@@ -48,7 +46,7 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		if msg.err != nil {
 			m.title = "Services"
 			m.body = msg.err.Error()
-			m.prevScreen = screenMain
+			m.prevScreen = screenSettings
 			m.screen = screenOutput
 			return m, nil
 		}
@@ -62,7 +60,7 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		if msg.err != nil {
 			m.title = "interfaces"
 			m.body = msg.err.Error()
-			m.prevScreen = screenMain
+			m.prevScreen = screenNetwork
 			m.screen = screenOutput
 			return m, nil
 		}
@@ -84,13 +82,12 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		m.screen = screenExportTargets
 		m.cursor = 0
 		return m, nil
-	case bannerMsg:
-		m.banner = strings.TrimSpace(msg.text)
+	case panelMsg:
+		m.panel = msg.data
 		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 {
@@ -100,7 +97,7 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 			m.nvidiaSATCancel()
 			m.nvidiaSATCancel = nil
 		}
-		m.prevScreen = screenAcceptance
+		m.prevScreen = screenHealthCheck
 		m.screen = screenOutput
 		m.title = msg.title
 		if msg.err != nil {
@@ -115,22 +112,23 @@ func (m model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 		}
 		return m, nil
 	}
-
 	return m, nil
 }
 
 func (m model) updateKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 	switch m.screen {
 	case screenMain:
-		return m.updateMenu(msg, len(m.mainMenu), m.handleMainMenu)
+		return m.updateMain(msg)
+	case screenHealthCheck:
+		return m.updateHealthCheck(msg)
+	case screenSettings:
+		return m.updateMenu(msg, len(m.settingsMenu), m.handleSettingsMenu)
 	case screenNetwork:
 		return m.updateMenu(msg, len(m.networkMenu), m.handleNetworkMenu)
 	case screenServices:
 		return m.updateMenu(msg, len(m.services), m.handleServicesMenu)
 	case screenServiceAction:
 		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:
@@ -146,6 +144,10 @@ func (m model) updateKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 			m.body = ""
 			m.title = ""
 			m.pendingAction = actionNone
+			// Refresh panel when returning to main screen.
+			if m.prevScreen == screenMain {
+				return m, func() tea.Msg { return panelMsg{data: m.app.LoadHardwarePanel()} }
+			}
 			return m, nil
 		case "ctrl+c":
 			return m, tea.Quit
@@ -155,13 +157,54 @@ func (m model) updateKey(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
 	case screenConfirm:
 		return m.updateConfirm(msg)
 	}
-
 	if msg.String() == "ctrl+c" {
 		return m, tea.Quit
 	}
 	return m, nil
 }
 
+// updateMain handles keys on the main (two-column) screen.
+func (m model) updateMain(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
+	if m.panelFocus {
+		return m.updateMainPanel(msg)
+	}
+	// Switch focus to right panel.
+	if (msg.String() == "tab" || msg.String() == "right" || msg.String() == "l") && len(m.panel.Rows) > 0 {
+		m.panelFocus = true
+		return m, nil
+	}
+	return m.updateMenu(msg, len(m.mainMenu), m.handleMainMenu)
+}
+
+// updateMainPanel handles keys when right panel has focus.
+func (m model) updateMainPanel(msg tea.KeyMsg) (tea.Model, tea.Cmd) {
+	switch msg.String() {
+	case "up", "k":
+		if m.panelCursor > 0 {
+			m.panelCursor--
+		}
+	case "down", "j":
+		if m.panelCursor < len(m.panel.Rows)-1 {
+			m.panelCursor++
+		}
+	case "enter":
+		if m.panelCursor < len(m.panel.Rows) {
+			key := m.panel.Rows[m.panelCursor].Key
+			m.busy = true
+			m.busyTitle = key
+			return m, func() tea.Msg {
+				r := m.app.ComponentDetailResult(key)
+				return resultMsg{title: r.Title, body: r.Body, back: screenMain}
+			}
+		}
+	case "tab", "left", "h", "esc":
+		m.panelFocus = false
+	case "q", "ctrl+c":
+		return m, tea.Quit
+	}
+	return m, nil
+}
+
 func (m model) updateMenu(msg tea.KeyMsg, size int, onEnter func() (tea.Model, tea.Cmd)) (tea.Model, tea.Cmd) {
 	if size == 0 {
 		size = 1
@@ -179,7 +222,10 @@ func (m model) updateMenu(msg tea.KeyMsg, size int, onEnter func() (tea.Model, t
 		return onEnter()
 	case "esc":
 		switch m.screen {
-		case screenNetwork, screenServices, screenAcceptance:
+		case screenNetwork, screenServices:
+			m.screen = screenSettings
+			m.cursor = 0
+		case screenSettings:
 			m.screen = screenMain
 			m.cursor = 0
 		case screenServiceAction: