platform: mirror per-drive disk reports into techdump

Storage acceptance runs already write disk-<prefix>-report.txt (per-drive
health + pseudographic resource bars) into the timestamped bee-sat run dir.
Also mirror it into techdump, a sibling of baseDir under the same export
dir, so a support bundle surfaces these reports alongside the rest of the
diagnostics without anyone having to dig into a specific bee-sat run dir.

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

audit/internal/platform/sat.go

@@ -718,6 +718,15 @@ func (s *System) RunStorageAcceptancePack(ctx context.Context, baseDir string, e
 	}
 	sort.Strings(devices)
 
+	// Disk reports (per-drive health + pseudographic resource bars) are also
+	// mirrored into techdump, a sibling of baseDir under the same export dir,
+	// so support bundles surface them alongside the rest of the diagnostics
+	// without requiring anyone to dig into a timestamped bee-sat run dir.
+	techDumpDir := filepath.Join(filepath.Dir(baseDir), "techdump")
+	if err := os.MkdirAll(techDumpDir, 0755); err != nil {
+		return "", err
+	}
+
 	var summary strings.Builder
 	stats := satStats{}
 	fmt.Fprintf(&summary, "run_at_utc=%s\n", time.Now().UTC().Format(time.RFC3339))
@@ -771,7 +780,9 @@ func (s *System) RunStorageAcceptancePack(ctx context.Context, baseDir string, e
 			}
 		}
 		reportText := GenerateDiskReportText(index+1, devPath, deviceOutputs, time.Now().UTC())
-		_ = os.WriteFile(filepath.Join(runDir, "disk-"+prefix+"-report.txt"), []byte(reportText), 0644)
+		reportName := "disk-" + prefix + "-report.txt"
+		_ = os.WriteFile(filepath.Join(runDir, reportName), []byte(reportText), 0644)
+		_ = os.WriteFile(filepath.Join(techDumpDir, reportName), []byte(reportText), 0644)
 	}
 
 	writeSATStats(&summary, stats)