Implemented a module to detect backchannel segments, and updated the coalesce module to ignore them when coalescing same-speaker turns

internal/builtin/postprocess.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 
 	"gitea.maximumdirect.net/eric/seriatim/internal/autocorrect"
+	"gitea.maximumdirect.net/eric/seriatim/internal/backchannel"
 	"gitea.maximumdirect.net/eric/seriatim/internal/coalesce"
 	"gitea.maximumdirect.net/eric/seriatim/internal/config"
 	"gitea.maximumdirect.net/eric/seriatim/internal/model"
@@ -98,6 +99,23 @@ func (resolveOverlaps) Process(ctx context.Context, in model.MergedTranscript, c
 	}, nil
 }
 
+type backchannelPostprocessor struct{}
+
+func (backchannelPostprocessor) Name() string {
+	return "backchannel"
+}
+
+func (backchannelPostprocessor) Process(ctx context.Context, in model.MergedTranscript, cfg config.Config) (model.MergedTranscript, []report.Event, error) {
+	if err := ctx.Err(); err != nil {
+		return model.MergedTranscript{}, nil, err
+	}
+
+	out, tagged := backchannel.Apply(in)
+	return out, []report.Event{
+		report.Info("postprocessing", "backchannel", fmt.Sprintf("tagged %d backchannel segment(s)", tagged)),
+	}, nil
+}
+
 type coalescePostprocessor struct{}
 
 func (coalescePostprocessor) Name() string {