Enter at the end of a `> ` line now starts the next line with `> `,
mirroring list continuation. Nested `> > ` keeps its depth, and Enter on
an empty quote drops the marker to exit. Generalises `list_marker` to
`continuation_marker`.
The design record for Typoena — the decisions, specs, and bench write-ups
behind the writing appliance. Start with the ADRs for the
load-bearing choices, or the v0.1 specs for what the
first release actually does.
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