docs(testing): coverage guide should not prescribe a removed uploader

[hyperpolymath]

Completes the Codecov removal in this repo. wiki/testing/guide.md had a copy-paste block telling contributors to add uses: codecov/codecov-action@v3 with a coverage.lcov file — Codecov is not installed here or on the account, so following the guide would produce the same red CI this sweep removed, and Dependabot would eventually re-pin the tag.

Rewritten to state what .github/workflows/ci.yml really does (visibility-only coverage via bisect-ppx-report + actions/upload-artifact) and to point at docs/standards/TESTING.adoc, so the doc and the CI can't drift again. No functional workflow change: this file is documentation only.

[coderabbitai]

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• wiki/testing/guide.md

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< Like a moth to a flame, I'm drawn to bugs. >
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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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