release: promote OTP and prod deploy guards

[rhanka]

Summary

• promote the OTP backend release to master as one clean release commit
• include embedded graphify artifacts already merged in dev
• include prod deploy guards from fix(cd): preserve prod server on deploy #64 so manual prod dispatch preserves the existing prod server and refuses a third preserved prod server
• seed the backend smoke Wikidata fixture in CI so PR checks do not depend on live SPARQL availability

Release safety

• final merge commit must include [skip ci] to avoid automatic CD/dataprep-full on push master
• prod deploy will be triggered separately with dataprep_scope=none and deploy_target=prod
• release branch history is squashed so historical co-author trailers are not promoted to master

Checks

• PR checks must pass before merge

[coderabbitai]

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✨ Finishing Touches

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• Commit unit tests in branch release/otp-prod-2026-05-23

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