ci: restore workflows removed by v1.1.1 sync

[Anunnaki-Astronaut]

Summary

Restores the four GitHub Actions workflows unintentionally deleted when #4 synchronized the v1.1.1 extension files.

Restored workflows

• manifest.yml
• prospector.yml
• release.yml
• tests.yml

The files match their pre-#4 behavior. The only content cleanup is removal of trailing spaces from whitespace-only blank lines.

Verification

• Diff contains exactly the four restored workflow files
• All workflow YAML files parse successfully
• git diff --check passes
• Existing Python regression suite passes: 16/16
• No extension source or documentation files are changed

Release follow-up

After this PR is merged, please create and push tag v1.1.1 from the resulting main. The restored release.yml workflow is configured to build the extension release when a v* tag is pushed. The v1.1.1 implementation is already present on main from #4; the upstream tag and GitHub Release are the remaining publication steps.

[Anunnaki-Astronaut]

@dnzbk Thank you for merging the workflow restoration. The v1.1.1 release still needs the tag step: upstream currently has only v1.1.0 and v1.0.1, so the restored extension release workflow has not run.

Please create and push tag v1.1.1 at the current main commit (0a249b27cf709198d7a3562361b125cbbfc20454). That tag push should trigger .github/workflows/release.yml, which will build and publish the v1.1.1 GitHub Release and distribution ZIP.

[dnzbk]

@Anunnaki-Astronaut Done