Escape <summary> tags in quoted content to fix rendering

When quoted markdown content contains <summary> or </summary> tags
on their own lines (e.g., from compacted conversation summaries),
these interfere with <details>/<summary> HTML rendering in VS Code
and other markdown viewers.

Fix: escape standalone <summary> tags with backslash prefix.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: cboos

claude_code_log/markdown/renderer.py

@@ -85,7 +85,12 @@ def __init__(self, image_export_mode: str = "referenced"):
     # -------------------------------------------------------------------------
 
     def _quote(self, text: str) -> str:
-        """Prefix each line with '> ' to create a blockquote."""
+        """Prefix each line with '> ' to create a blockquote.
+
+        Also escapes <summary> tags that would interfere with <details> rendering.
+        """
+        # Escape <summary> and </summary> tags on their own lines
+        text = re.sub(r"^(</?summary>)$", r"\\\1", text, flags=re.MULTILINE)
         return "\n".join(f"> {line}" for line in text.split("\n"))
 
     def _code_fence(self, text: str, lang: str = "") -> str:

test/test_markdown_helpers.py

@@ -191,6 +191,21 @@ def test_empty_text(self, renderer):
         result = renderer._quote("")
         assert result == "> "
 
+    def test_escapes_summary_tags(self, renderer):
+        """Escapes <summary> tags that would interfere with <details> rendering."""
+        text = "Some text\n<summary>\nMore text\n</summary>\nEnd"
+        result = renderer._quote(text)
+        # Tags on their own lines get escaped with backslash
+        assert "> \\<summary>" in result
+        assert "> \\</summary>" in result
+
+    def test_preserves_inline_summary_tags(self, renderer):
+        """Does not escape <summary> tags that are inline with other content."""
+        text = "The <summary> tag is used in HTML"
+        result = renderer._quote(text)
+        # Inline tags are not escaped
+        assert result == "> The <summary> tag is used in HTML"
+
 
 class TestStripErrorTags:
     """Tests for the strip_error_tags() utility function."""