Review response: items not addressed (by design)

CodeRabbit items considered and intentionally not changed:

#8 (dag.md fenced blocks): No language identifiers on non-code blocks
    — project convention, not using markdownlint.

#10 (dag.py:204 recursive → iterative): Max recursion depth is bounded
    by session message count. Python's default limit (1000) is more than
    sufficient for any real conversation.

#11 (converter.py:463 queue ops at tail): Queue operations are metadata
    entries, not user-visible conversation content. Appending at tail is
    the intended behavior.

#12 (renderer.py:2012 current_render_session leak): By design — branch
    context applies to all subsequent messages until the next line start.
    The variable is reset when a new DAG-line starts.

#13 (session_nav.html:28 fork rows in expandable mode): Non-issue.
    Fork/branch nav items only appear in ToC mode (combined transcript
    and individual session pages). Expandable mode is only used in the
    project index page where fork items wouldn't be generated. Verified
    that individual session pages DO correctly include fork/branch nav.

#14 (message_styles.css:901 font quoting): Cosmetic stylelint preference,
    no stylelint configured in this project.

#15 (test_dag.py:44 error handling): Test helper — should fail loudly on
    bad test data, not silently skip.

Author: cboos