### Added

- The fragment guard now requires each entry to end with its issue
  citation: one `(#N)` group — local, `repo#N` or `owner/repo#N`
  references separated by `, ` — then the final `.` and nothing after it
  (#262).
- The refusal distinguishes an entry carrying no reference at all from one
  whose reference is present but not terminal, and names the shape to
  write in both (#262).
- The 300-character bound still outranks the citation across the whole
  fragment, and the outranked problem stays out of the message it lost
  to: one fragment, one diagnosis, wherever in the file it sits (#262).

### Changed

- `BUILDER.md` and `CHANGELOG.md` state the citation as guard-enforced
  rather than as house style, beside the 300-character bound it now sits
  next to (#262).
- Four fragments in flight gained a terminal citation; published sections
  are untouched, so no shipped prose is re-opened (#262).