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

docs/slack-setup-guide.md

@@ -296,7 +296,7 @@ python -m apps.slack_rag \
 
 Here's what you'll see when running a RAG query on your Slack workspace:
 
-![RAG Query Results](rag-query-results.png)
+
 
 **What this screenshot shows:**
 - ✅ **Successful MCP connection** to Slack workspace
@@ -312,7 +312,7 @@ This example shows a real query against the Sky Lab Computing workspace’s “r
 
 ### Screenshot
 
-![Sky Random RAG](videos/rag-sky-random.png)
+![Sky Random RAG](docs/videos/rag-sky-random.png)
 
 ### Prerequisites
 

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 = []