The PRD said a reader's rule could optionally stop on a date; the until
control was deliberately descoped from the form during planning, and the
PRD was written as though it shipped. Corrected the PRD to describe what
actually ships, and noted that the field still exists in the schema —
reachable today only by importing a file that carries one.
That gap had a second-order bug behind it: because the edit form rebuilt
`repeat` from scratch on every save, hard-coding `until: null`, a rule that
already carried a non-null `until` had it silently reset to eternal on any
edit at all, including a pure title fix. Extracted the `repeat`-building
logic into `repeatFrom`, which now carries `initial?.repeat?.until` forward,
and is exported so the behaviour is provable without a submit nothing in
this suite's renderToStaticMarkup tests can click.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
