fix: remove divider between header and table

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: rnetser

src/rootcoz_slack_digest/slack_format.py

@@ -398,7 +398,6 @@ def build_message(
         )
         blocks: list[dict[str, object]] = [
             {"type": "section", "text": {"type": "mrkdwn", "text": header}},
-            {"type": "divider"},
             *table_blocks,
         ]
         if omitted_text:

tests/test_slack_format.py

@@ -213,10 +213,11 @@ def test_build_message_blocks_use_table() -> None:
     )
     assert isinstance(payload, list)
     types = [b.get("type") for b in payload]
-    assert types[:2] == ["section", "divider"]
+    assert types[0] == "section"
+    assert "divider" not in types
     tables = [b for b in payload if b.get("type") == "data_table"]
     assert len(tables) == 2
-    # Tier headers between divider and tables when multiple tiers
+    # Tier headers before tables when multiple tiers
     assert "*gating*" in str(payload)
     assert "*other*" in str(payload)
     gate_table = tables[0]