Complete Zenodo production environment setup

[edithatogo]

Summary

• allow explicit production selection for draft inspection and draft-file listing
• replace stale sandbox-only runtime wording with endpoint-neutral Zenodo messages
• document production draft read commands

Validation

• go test -p 1 ./internal/cli ./internal/zenodopublish ./internal/zenodotransfer
• go vet -p 1 ./internal/cli ./internal/zenodopublish ./internal/zenodotransfer
• go run ./tools/checkstubs
• go run ./tools/checkfeaturematrix
• go run ./tools/checkregistries
• mkdocs build --strict

No live Zenodo write was performed.

[gemini-code-assist]

Caution

The consumer version of Gemini Code Assist on GitHub has been sunset. All code review activity has officially ceased.

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