`nimble build` errors on Linux on jtv/v2 branch

In the GitHub Actions environment, when trying to run `nimble test` or `nim r tests/test.nim`:

```text
/home/runner/work/con4m/con4m/tests/test.nim(3, 18) Error: undeclared identifier: 'toAnsiCode'
candidates (edit distance, scope distance); see '--spellSuggest':
(6, 4): 'AtomicNodes'
(6, 4): 'HtmlNode'
(6, 4): 'ItalicOff'
Tip: 6 messages have been suppressed, use --verbose to show them.
tools.nim(36) doCmd

Error: Execution failed with exit code 1
... Command: /home/runner/work/con4m/con4m/nimdir/bin/nim c --noNimblePath -d:NimblePkgVersion=0.2.0 --path:/home/runner/.nimble/pkgs2/nimutils-0.2.1-4689d581a064f06b3dbdcb2e60175a93c36797dd --path:/home/runner/.nimble/pkgs2/unicodedb-0.12.0-445[24](https://github.com/crashappsec/con4m/actions/runs/7958493760/job/21723477313#step:5:25)16471e2fe87[26](https://github.com/crashappsec/con4m/actions/runs/7958493760/job/21723477313#step:5:27)eb6070ed6ea7368171cc09 --hints:off -r --path:. /home/runner/work/con4m/con4m/tests/test
```

Start with tests/test.nim and the nimble test or nim r tests/test.nim commands from the linked GitHub Actions run. Trace how toAnsiCode is expected to be provided, reproduce the failure on Linux, and confirm that the test command completes without the undeclared-identifier error.

Written by the indexing model from the issue text.