Stop new em-dashes from entering the repository #25

Parent

#21

What to build

A test fails when an em-dash appears in any tracked text file, with three exceptions: docs/mde, which holds third-party papers, lecture material and coursework kept verbatim; CHANGELOG.md, which release-please writes; and a list of the files that still contain one today. The list can only shrink: a listed file that no longer contains an em-dash also fails the test, so each rewrite batch takes its files off the list.

From this pull request on, new prose is written without em-dashes, using a comma, a colon, a full stop or parentheses instead, and CONTRIBUTING.md says so.

Acceptance criteria

• Adding an em-dash to a file that is not on the list fails the test, and the failure names the file.
• A listed file with no em-dash left fails the test until it is taken off the list.
• Nothing under docs/mde, and not CHANGELOG.md, is ever scanned.
• The list holds exactly the files that contain an em-dash today.

Blocked by

• Run the suite on Vitest and make the tooling strict TypeScript #22