fix(webui): repair broken scenario Run button onclick, dedupe build.sh overlay staging

- page_scenario.go: onclick built via JSON.stringify() embedded raw double
  quotes inside a double-quoted HTML attribute, truncating the attribute so
  the click handler never compiled; pass the name through an escaped
  data-scenario-name attribute instead.
- build.sh: overlay staging rsyncs (OVERLAY_DIR->stage, stage->includes.chroot)
  ran without --delete, so a scenario removed from the repo (a9924b0) stayed
  baked into every ISO built from the persistent stage cache since — the
  "second script" in the Scenario page's list.
- blackbox: rewritten around a deterministic local zip + incremental
  patch-the-changed-suffix onto removable media, instead of walking/copying
  ~90 files through a synchronous ntfs-3g FUSE mount every cycle. journalctl
  captures are now "--since last sync" (were "--since boot", growing with
  uptime) and metrics.db is excluded (was copied whole every cycle).
- scenario: nvbandwidth-acs-ab now escalates GPU count (same-socket pair,
  other socket's pair, one cross-socket pair, all GPUs) under each ACS state
  instead of always running all 6 GPUs at once, using a new `bee
  gpu-bandwidth-groups` subcommand that discovers socket layout from
  `nvidia-smi topo -m` at runtime — gpu_indices is host-specific, so this
  can't be baked into the scenario file.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

audit/internal/app/bundle_layout.go

@@ -68,8 +68,11 @@ func keepForBundleCopy(rel string, _ os.FileInfo) bool {
 //     export/ here is expected (e.g. a SAT run's narrative disk report).
 //
 // Used by both BuildSupportBundle (on-demand tar.gz) and the blackbox USB
-// mirror, so both artifacts share one shape.
-func categorizeExportTree(srcExportDir, destRoot string) error {
+// mirror, so both artifacts share one shape. includeMetricsDB is false for
+// the blackbox mirror: metrics.db is a live, growing SQLite file and copying
+// it whole every sync cycle was a major contributor to slow blackbox cycles
+// (see blackbox_archive.go); the on-demand support bundle still wants it.
+func categorizeExportTree(srcExportDir, destRoot string, includeMetricsDB bool) error {
 	exportDir := filepath.Join(destRoot, "export")
 	statusDir := filepath.Join(destRoot, "status")
 	tasksDir := filepath.Join(destRoot, "tasks")
@@ -134,9 +137,11 @@ func categorizeExportTree(srcExportDir, destRoot string) error {
 			return err
 		}
 	}
-	if _, err := os.Stat(DefaultMetricsDBPath); err == nil {
-		if err := copyPath(DefaultMetricsDBPath, filepath.Join(statusDir, "metrics.db")); err != nil {
-			return err
+	if includeMetricsDB {
+		if _, err := os.Stat(DefaultMetricsDBPath); err == nil {
+			if err := copyPath(DefaultMetricsDBPath, filepath.Join(statusDir, "metrics.db")); err != nil {
+				return err
+			}
 		}
 	}