Propagate the 9.5.1 patch version into the Claude and Codex
plugin manifests plus the generated Claude marketplace metadata.
This keeps release:preflight from leaving tracked changes after the
release sync step.
Refs #445
Record the versioned plugin metadata and onboarding docs refreshed by the release preflight so the release workflow can continue from a clean main branch.
Capture the plugin manifest version bumps that release:prepare generated for 9.0.0 and update the release staging step so Claude and Codex plugin manifests are included automatically in future release commits.