refactor: harden diagnostics and consolidate runtime code

audit/internal/app/app_install.go

@@ -1,7 +1,6 @@
 package app
 
 import (
-	"context"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -14,20 +13,6 @@ func (a *App) ListRemovableTargets() ([]platform.RemovableTarget, error) {
 	return a.exports.ListRemovableTargets()
 }
 
-// ListScenarioFilesOnRemovableMedia lists scenarios/*.json found on any
-// mounted removable target (e.g. the blackbox USB stick) — see
-// platform.System.ListScenarioFilesOnRemovableMedia.
-func (a *App) ListScenarioFilesOnRemovableMedia() ([]platform.ScenarioFileOnRemovableMedia, error) {
-	return a.exports.ListScenarioFilesOnRemovableMedia()
-}
-
-// ReadScenarioFromRemovableMedia reads scenarios/<name>.json from whichever
-// mounted removable target has it — see
-// platform.System.ReadScenarioFromRemovableMedia.
-func (a *App) ReadScenarioFromRemovableMedia(name string) ([]byte, error) {
-	return a.exports.ReadScenarioFromRemovableMedia(name)
-}
-
 // ListAvailableScenarios lists every scenario runnable via ReadScenario:
 // shipped with the image plus anything found on removable media — see
 // platform.System.ListAvailableScenarios.
@@ -86,7 +71,3 @@ func (a *App) ExportSupportBundleResult(target platform.RemovableTarget) (Action
 func (a *App) ListInstallDisks() ([]platform.InstallDisk, error) {
 	return a.installer.ListInstallDisks()
 }
-
-func (a *App) InstallToDisk(ctx context.Context, device string, logFile string) error {
-	return a.installer.InstallToDisk(ctx, device, logFile)
-}