Separate integration tests into standalone workflow with build tag

[Copilot]

• Add //go:build testintegration build tag to all test files in internal/testintegration/ (3 files: doc_test.go, helpers_spec_test.go, spec_test.go)
• Create new standalone workflow .github/workflows/integration-test.yml with:
  • Triggers: push to master + pull_request (same as go-test.yml)
  • Simplified matrix: linux + windows, stable Go only (2 jobs instead of 6)
  • No -race flag
  • Build tags: testintegration
  • Coverage upload via artifacts (no test report)
  • No fuzz test
• Add doc.go to internal/testintegration/ to satisfy linter (no Go source without build tag)
• Validated: without tag, no integration tests run; with tag, all 6 tests found
• Validated: root module tests unaffected
• Code review passed (no comments)
• Security scan passed (0 alerts)

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[fredbi]

@copilot now with the tags the linter complains there is no go code in this module.

Please add an empty doc.go with just a package level comment.

[Copilot]

@copilot now with the tags the linter complains there is no go code in this module.

Please add an empty doc.go with just a package level comment.

Added internal/testintegration/doc.go with a package-level comment in 82a4ec3. This provides a non-test Go source file so the linter no longer complains about an empty module.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.49%. Comparing base (18e543f) to head (82a4ec3).
⚠️ Report is 2 commits behind head on master.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #166      +/-   ##
==========================================
- Coverage   91.54%   91.49%   -0.05%     
==========================================
  Files          17       17              
  Lines        2034     2034              
==========================================
- Hits         1862     1861       -1     
- Misses        114      115       +1     
  Partials       58       58              

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