[rteoo]

Summary

• Publish only bcb-data from PyPI and TestPyPI workflows, and build/smoke-test only the canonical distribution in CI and the local release helper.
• Freeze the final bcbpy distribution at 2.5.0 with bcb-data==2.5.0; retain its source unchanged and remove the test requirement to track future canonical versions.
• Document the final compatibility release and archival policy in the README, migration guide, and project instructions.

Testing

• 157 offline tests and 9 subtests passed; live integration tests excluded.
• Simulated bcb-data 2.6.0 in a disposable source copy while leaving compat/bcbpy unchanged: sdist/wheel builds, strict Twine checks, the CI wheel glob/import command, and all 157 offline tests passed.
• Parsed all workflows and verified that only canonical publishing remains, with existing OIDC permissions, artifact paths, and environments preserved.
• Confirmed no compatibility source or metadata files changed. Hosted CI is pending.

Risks

• bcbpy 2.5.0 remains pinned to bcb-data 2.5.0 and receives no further updates; users must install/import bcb-data/bcb_data directly for future releases.
• The completed v2.5.0 release and its historical workflow are unchanged. No new package release, archive action, or access-control change is included.