ci: latest Actions + raise pluginsdk coverage gate to 90%

[JonahMMay]

Summary

• Bump Actions to current majors.
• Raise COVER_MIN to 90% for pkg/pluginsdk (excluding thin runtime go-plugin Serve/GRPC glue from the cover profile, same idea as existing runtimedefault exclusion; runtime tests still run). Local coverage ~94.4%.

  

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: c057f0d2-ff23-4845-9fc4-a27c26c916ba

📥 Commits

Reviewing files that changed from the base of the PR and between e10a0ea and 9bc1bd1.

📒 Files selected for processing (7)

• .github/workflows/ci.yml
• .github/workflows/release.yml
• pkg/pluginsdk/config/config_more_test.go
• pkg/pluginsdk/convert/convert_more_test.go
• pkg/pluginsdk/httpclient/httpclient_test.go
• pkg/pluginsdk/manifest/coverage_more_test.go
• pkg/pluginsdk/runtimehost/coverage_more_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cursor/ci-actions-coverage-90-d242

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