Add direct YouTube upload to publish pipeline, publish ep14

Bypass flaky YouTube RSS ingestion by converting MP3+cover to MP4
and uploading via YouTube Data API. Videos are auto-added to the
podcast playlist. Includes yt_auth.py for token management.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

yt_auth.py

@@ -0,0 +1,49 @@
+#!/usr/bin/env python3
+"""Re-authenticate YouTube API with full scopes (upload + playlist management).
+
+Run this directly in your terminal when the YouTube token expires or needs new scopes:
+    python yt_auth.py
+
+It will open a browser for Google OAuth consent, then save the token.
+"""
+from pathlib import Path
+from google.oauth2.credentials import Credentials
+from google_auth_oauthlib.flow import InstalledAppFlow
+from google.auth.transport.requests import Request
+from googleapiclient.discovery import build as yt_build
+
+CLIENT_SECRETS = Path(__file__).parent / "youtube_client_secrets.json"
+TOKEN_FILE = Path(__file__).parent / "youtube_token.json"
+SCOPES = [
+    "https://www.googleapis.com/auth/youtube.upload",
+    "https://www.googleapis.com/auth/youtube",
+]
+
+def main():
+    if not CLIENT_SECRETS.exists():
+        print("Error: youtube_client_secrets.json not found")
+        print("Download OAuth2 Desktop App credentials from Google Cloud Console")
+        return
+
+    print("Opening browser for Google OAuth...")
+    flow = InstalledAppFlow.from_client_secrets_file(str(CLIENT_SECRETS), SCOPES)
+    creds = flow.run_local_server(port=8090, open_browser=True)
+
+    with open(TOKEN_FILE, "w") as f:
+        f.write(creds.to_json())
+    print(f"Token saved to {TOKEN_FILE}")
+
+    # Verify it works
+    youtube = yt_build("youtube", "v3", credentials=creds)
+    ch = youtube.channels().list(part="snippet", mine=True).execute()
+    name = ch["items"][0]["snippet"]["title"] if ch.get("items") else "unknown"
+    print(f"Authenticated as: {name}")
+
+    # Test playlist access
+    pl = youtube.playlists().list(part="snippet", mine=True, maxResults=50).execute()
+    print(f"Playlists: {len(pl.get('items', []))}")
+    for p in pl.get("items", []):
+        print(f"  - {p['snippet']['title']} ({p['id']})")
+
+if __name__ == "__main__":
+    main()