* fix(release): publish from explicit source checkpoints
Dispatch preparation and publication against a frozen release branch.
Bind package builds and provenance to the same tagged commit, enable
release-branch PR CI, and document the maintainer workflow.
Assisted-by: Sakuya (gensokyo-skills:sakuya-checkpointed-execution)
* fix(release): drive checkpoint releases from frozen branches
Use branch pushes for Release Please preparation and reviewed-merge publication.
Reject moved source refs before tagging and bind registry provenance to the
triggering release commit. Remove phase inputs and document the three steps.
Assisted-by: Sakuya (gensokyo-skills:sakuya-checkpointed-execution)
Assisted-by: Cirno (gensokyo-skills:cirno-radical-simplification)
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