Docs/CI: fix broken image paths and ruff lint\n\n- Move screenshot to docs/videos and update references\n- Remove obsolete rag-query-results image\n- Rename variable to satisfy ruff

tests/test_channel_by_id_or_name.py

@@ -120,9 +120,9 @@ async def fetch(
             print("=" * 60)
             q_terms = [t.strip().lower() for t in query.split() if t.strip()]
             lines = [
-                l
-                for l in (text_blob.splitlines() if text_blob else [])
-                if l and not l.startswith("MsgID,")
+                line
+                for line in (text_blob.splitlines() if text_blob else [])
+                if line and not line.startswith("MsgID,")
             ]
             # Score lines by count of query terms present
             scored = []