fix(slack): keep blank-line-separated ordered items in one rich_text_list

When a Markdown ordered list has blank lines between items (common in
LLM-authored content), the list run loop breaks on each blank line.
Slack numbers each rich_text_list independently, so N items produce N
lists each starting at 1.

Skip blank lines inside the list run as soft separators instead of
breaking, so ordered items stay in one rich_text_list and Slack renders
the correct numbering.

Fixes #57076

plugins/platforms/slack/block_kit.py

@@ -451,6 +451,10 @@ def render_blocks(
                         indent, ordered, txt = items[-1]
                         items[-1] = (indent, ordered, txt + " " + lines[i].strip())
                         i += 1
+                    elif not lines[i].strip():
+                        # blank line — soft separator within a list run;
+                        # skip so that ordered items stay in one rich_text_list.
+                        i += 1
                     else:
                         break
                 blocks.append(_list_block(items))

tests/gateway/test_slack_block_kit.py

@@ -90,6 +90,22 @@ class TestInlineFormatting:
         ]
         assert styled, "expected a bold-styled text element in the list item"
 
+    def test_blank_line_separated_ordered_items_stay_in_one_list(self):
+        """Regression: blank lines between ordered items must not reset numbering.
+
+        Slack numbers each rich_text_list independently.  If blank lines break
+        the list run, N items produce N separate lists each starting at 1.
+        See: https://github.com/NousResearch/hermes-agent/issues/57076
+        """
+        md = "1. alpha\n\n1. beta\n\n1. gamma"
+        blocks = render_blocks(md)
+        rich = [b for b in blocks if b["type"] == "rich_text"][0]
+        lists = [e for e in rich["elements"] if e["type"] == "rich_text_list"]
+        # Must be ONE list with 3 items, not 3 separate single-item lists
+        assert len(lists) == 1
+        items = lists[0]["elements"]
+        assert len(items) == 3
+
 
 class TestTables:
     def test_pipe_table_renders_native_table_block(self):