[veralizeth]

Add IssuesService.ListArtifacts, GetArtifact, CreateArtifact, UpdateArtifact, and DeleteArtifact, with typed artifacts and version history. Get preserves the stable {artifact, versions} envelope; artifact paths use issue-scoped numbers rather than global IDs. Updates preserve omitted fields and can send explicit empty strings.

Wire shapes are based on the public CLI artifact models and REST client fixtures. The artifact endpoint is not yet published in the public REST/OpenAPI documentation, and the pagination-header contract described below has not yet been deployed; runtime compatibility is not claimed.

List uses standard ListOptions and returns the standard *Response. The planned endpoint contract provides standard Link headers, so Response.NextPage and generated ListArtifactsIter are supported; no synthetic pagination metadata is added. Offset pagination has no snapshot guarantee. The public API documentation is still pending.

Includes nullable actors, timestamps, and HTML fields, typed version history, request/error tests, generated accessors/string tests, and an iterator test covering Link traversal, filter preservation, and options immutability.

Validation: targeted issue-artifact and iterator tests; full go test -race ./github; script/test.sh, script/fmt.sh, script/generate.sh --check, and script/lint.sh passed. No live artifacts were created or modified.

Assisted contribution: GitHub Copilot helped implement and review the SDK methods, tests, and PR description.

[google-cla]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.64%. Comparing base (6eccc42) to head (a429e7a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4677   +/-   ##
=======================================
  Coverage   98.63%   98.64%           
=======================================
  Files         201      202    +1     
  Lines       18951    19013   +62     
=======================================
+ Hits        18693    18755   +62     
  Misses        258      258           

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[gmlewis]

@veralizeth - this PR is currently in the state where there are two authors:

The following contributors were found for this pull request:
❌ a429e7a Author: @veralizeth <47796851+veralizeth​@users.noreply.github.com>
❌ a429e7a Co-Author: @Copilot <223556219+Copilot​@users.noreply.github.com>

To fix this, you will either need to rewrite the commits locally so that you are the only author (and are the one who has signed the CLA), and then force-push to this PR to remove the copilot commit, or close this PR and start a new one where you are the only author.

Sorry for the inconvenience.