_extract_python_rationale / _extract_js_rationale sliced the raw
docstring/comment text to 80 characters before collapsing whitespace,
so the cut could land mid-word, leave a run of literal spaces where a
newline + indentation used to be, and, when the cut landed on a ".",
produce an Obsidian export filename ending in "..md".
Both _add_rationale sites now share _shorten_rationale_label, which
normalizes whitespace first via textwrap.shorten (word-boundary safe,
adds a placeholder only when it actually truncates) and falls back to
a plain character truncation when shorten collapses to a bare
placeholder -- which it does when the first word alone is already
>= 80 chars (e.g. a comment opening with one long URL), a case that
would otherwise regress to a content-free label.
Yyunozor
b1eadad05b