The echo body wrote `no longer blocked by #9` unbackticked, twice in one
sentence. GitHub linkifies both, so every echo posted a pair of "mentioned in"
events onto this repo's issue #9 — an issue with nothing to do with the one
being echoed. On a 15-minute cron that is one pair per `blocked` issue on the
board, and the first sweep after merge would have written the whole board's
worth at once.
The file's own convention two branches down already avoids this: the
`blocked-unparseable` comment code-spans its `Blocked by #N` for exactly this
reason. The prose is unchanged, the rendered set is unchanged, and the marker
digests the parsed set rather than the comment body, so no marker moves.
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