Add transcript description prompt context

internal/cli/run.go

@@ -74,12 +74,13 @@ var processRunner = func(inv processInvocation, stdout io.Writer) (*normalizatio
 	}
 
 	if err := runDir.WriteInvocationMetadata(diagnostics.InvocationMetadata{
-		Operation:      "process",
-		TranscriptPath: inv.TranscriptPath,
-		GlossaryPath:   inv.GlossaryPath,
-		OutputPath:     inv.OutputPath,
-		ReportJSONPath: inv.ReportJSONPath,
-		Modules:        append([]string(nil), inv.Config.Modules...),
+		Operation:             "process",
+		TranscriptPath:        inv.TranscriptPath,
+		GlossaryPath:          inv.GlossaryPath,
+		OutputPath:            inv.OutputPath,
+		ReportJSONPath:        inv.ReportJSONPath,
+		TranscriptDescription: inv.Config.TranscriptDescription,
+		Modules:               append([]string(nil), inv.Config.Modules...),
 	}); err != nil {
 		_ = runDir.WriteErrorLog(fmt.Sprintf("invocation_metadata: %v", err))
 	}
@@ -435,6 +436,8 @@ func runProcess(args []string, stdout, stderr io.Writer) int {
 			overrides.NormalizeMaxSegmentDuration = pFlags.normalizeMaxSegmentDuration
 		case "normalize-max-segment-tokens":
 			overrides.NormalizeMaxSegmentTokens = pFlags.normalizeMaxSegmentTokens
+		case "transcript-description":
+			overrides.TranscriptDescription = pFlags.transcriptDescription
 		case "work-dir":
 			overrides.WorkDir = pFlags.workDir
 		case "work-dir-retention":
@@ -710,6 +713,7 @@ type processFlags struct {
 	normalizeEllipsisGap          *float64
 	normalizeMaxSegmentDuration   *float64
 	normalizeMaxSegmentTokens     *int
+	transcriptDescription         *string
 	workDir                       *string
 	workDirRetention              *string
 }
@@ -769,6 +773,7 @@ func newProcessFlagSet(cfg config.Config, stderr io.Writer) (*flag.FlagSet, proc
 		normalizeEllipsisGap:          fs.Float64("normalize-ellipsis-gap", cfg.Normalization.EllipsisGap, "Gap threshold for ellipsis insertion"),
 		normalizeMaxSegmentDuration:   fs.Float64("normalize-max-segment-duration", cfg.Normalization.MaxSegmentDuration, "Maximum merged segment duration"),
 		normalizeMaxSegmentTokens:     fs.Int("normalize-max-segment-tokens", cfg.Normalization.MaxSegmentTokens, "Maximum merged segment token estimate"),
+		transcriptDescription:         fs.String("transcript-description", cfg.TranscriptDescription, "Brief background context for LLM prompts; does not override transcript content"),
 		workDir:                       fs.String("work-dir", cfg.WorkDir, "Per-run work directory"),
 		workDirRetention:              fs.String("work-dir-retention", string(cfg.WorkDirRetention), "Work-dir retention policy: auto|always|never"),
 	}