Fix release workflow dispatch after auto tag

[sionsmith]

Summary

• add workflow_dispatch support to the release workflow
• let Auto Tag explicitly dispatch release.yml after creating a new version tag with GITHUB_TOKEN

Verification

• workflow YAML parse
• git diff --check

Release note

The existing v0.1.2 tag was created successfully, but GitHub did not start release.yml from the GITHUB_TOKEN tag push. After this merges, release.yml can be dispatched for v0.1.2 and future auto-tags will dispatch it automatically.