ceremony/changelog.d/262.md

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).

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).