Contextualizing definitions for export

Description of problem

The terminology include file is being processed, but restrictReferences() is failing, which results in unused terms appearing in the final document, each of which generates a warning.

URL to affected spec or repo:

https://w3c.github.io/vc-use-cases/

What happened (e.g., it crashed)?:

ReferenceError: $ is not defined
    at restrictReferences (common.js:123:5)
    at ln (utils.js:294:28)
    at Ls (data-include.js:54:16)
    at data-include.js:98:7
    at async Promise.all (/vc-use-cases/index 34)
    at async Ps (data-include.js:107:6)
    at async Object.run (data-include.js:77:8)
    at async base-runner.js:72:27

Expected behavior (e.g., it shouldn't crash):

Unused terms should be removed.

Optional, steps to reproduce:

See https://github.com/w3c/vc-use-cases/blob/2023-08-25-cleanup/index.html and https://github.com/w3c/vc-use-cases/blob/2023-08-25-cleanup/terms.html.

Fails under Chrome Version 116.0.5845.96 (Official Build) (x86_64) on MacBook Pro, macOS Monterey 12.6.7.

Start at restrictReferences in common.js:123 and trace its callers in utils.js:294 and data-include.js:54. Reproduce with index.html and terms.html from the linked vc-use-cases revision, then verify that unused terms are removed without a ReferenceError or generated warnings.