Skip YouTube Shorts in channel/playlist discovery

Spike's Car Radio is an active Shorts channel and its 60-second clips
were being downloaded as podcast content. yt-dlp reports these as
media_type 'short'; record such videos as skipped so they are neither
downloaded nor re-resolved. Applies to all YouTube feeds.

main.go

@@ -195,6 +195,16 @@ func pollYouTube(feed config.Feed, sm *state.Manager, jobs chan<- downloader.Dow
 			continue
 		}
 
+		// YouTube Shorts are not podcast content: record as skipped so they
+		// are never downloaded and never re-resolved.
+		if info.MediaType == "short" {
+			dp := computeYTDestPath(feed.OutputDir, info.UploadDate, info.Title, v.ID)
+			if sm.AddJobWithStatus(feed.URL, watchURL(v.ID), dp, state.StatusSkipped, info.Duration) {
+				skipped++
+			}
+			continue
+		}
+
 		// Out of the start_date window. Record as skipped so it isn't
 		// re-resolved next poll. (Channel video order is not reliably
 		// newest-first — e.g. the Iron Culture channel lists recent episodes

ytdlp/ytdlp.go

@@ -81,6 +81,8 @@ type VideoInfo struct {
 	Title      string
 	Duration   float64 // seconds, 0 if unknown
 	UploadDate time.Time
+	// MediaType is "video", "short", or "livestream" ("" if unknown).
+	MediaType  string
 	LiveStatus string // "not_live", "is_live", "was_live", "is_upcoming", or "" if unknown
 	// ReleaseTimestamp is the scheduled start time of a live stream in unix
 	// seconds (from liveBroadcastDetails.startTimestamp); 0 if unknown.
@@ -129,6 +131,7 @@ func Info(ctx context.Context, s Settings, videoID string) (VideoInfo, error) {
 		}
 	}
 	info.LiveStatus, _ = data["live_status"].(string)
+	info.MediaType, _ = data["media_type"].(string)
 	if ts, ok := num(data["release_timestamp"]); ok {
 		info.ReleaseTimestamp = int64(ts)
 	}