Implemented a new internal/danglers package with deterministic two-pass dangling-end then dangling-start resolution

internal/builtin/postprocess.go

@@ -9,6 +9,7 @@ import (
 	"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/danglers"
 	"gitea.maximumdirect.net/eric/seriatim/internal/filler"
 	"gitea.maximumdirect.net/eric/seriatim/internal/model"
 	"gitea.maximumdirect.net/eric/seriatim/internal/overlap"
@@ -169,6 +170,27 @@ func (coalescePostprocessor) Process(ctx context.Context, in model.MergedTranscr
 	}, nil
 }
 
+type resolveDanglersPostprocessor struct{}
+
+func (resolveDanglersPostprocessor) Name() string {
+	return "resolve-danglers"
+}
+
+func (resolveDanglersPostprocessor) 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, summary := danglers.Apply(in)
+	return out, []report.Event{
+		report.Info(
+			"postprocessing",
+			"resolve-danglers",
+			fmt.Sprintf("merged %d dangling segment(s) into %d target segment(s)", summary.DanglersMerged, summary.TargetsChanged),
+		),
+	}, nil
+}
+
 type autocorrectPostprocessor struct{}
 
 func (autocorrectPostprocessor) Name() string {