Nothing checks that glossary.json has the shape the page expects #54

Context

js/glossary.js reads term, short, full and seeAlso. A contributor adding an entry can misspell a key, omit short, or make seeAlso a string instead of an array, and CI will happily pass — the page just renders a half-empty card.

What to change

Files: A new script, plus .github/workflows/lint.yml

Requirements:

• Add a checker that validates every entry has term and short as non-empty strings
• full is optional; seeAlso, when present, must be an array of strings
• Fail on duplicate terms, case-insensitively
• Report the offending entry by term and index, not just "invalid"
• Wire it into the existing lint workflow as a blocking check
• Follow scripts/build_contributors.py for style — Python 3 standard library only

Acceptance criteria

• A malformed entry fails the check with a message naming it
• A duplicate term fails
• The current file passes
• It runs in CI on every pull request
• The error message tells a first-time contributor how to fix it

How to verify locally

python3 scripts/check_glossary.py

Difficulty

Intermediate. Mirrors what build_contributors.py --check does for the wall.

New here? Comment /claim on this issue and a bot will assign it to you. Then read CONTRIBUTING.md.

Stuck at any point? Comment here saying what you have tried and where it stopped working — that is not an admission of failure, it is how we find out the instructions were unclear. You can also come to a PR Debug Clinic (Oct 12 or Oct 21).