test(normalize): rebase remote refs against a local httptest server

[fredbi]

The remote ref cases used a hardcoded https://example.com base, a domain we don't control. They now rebase against an httptest TLS server, so the base URL is locally owned and carries a port, a shape the previous fixture never covered. A closing check fetches the rebased ref to confirm it resolves against that server.

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[fredbi]

supersedes #222

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.02%. Comparing base (d5b5620) to head (687540e).
⚠️ Report is 3 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #231   +/-   ##
=======================================
  Coverage   92.02%   92.02%           
=======================================
  Files          30       30           
  Lines        3399     3399           
=======================================
  Hits         3128     3128           
  Misses        189      189           
  Partials       82       82           

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