Remove auto-tag, document manual tagging

Summary

  • Remove auto-tag CI job — CI_JOB_TOKEN can push tags but can't trigger a pipeline for them (by design), and the tags API is read-only for job tokens
  • Update CLAUDE.md with manual tagging instructions and a reminder to push a tag after merging version bumps

Test plan

  • CI pipeline should pass (no more auto-tag job to fail)
  • After merge, manually tag and push to verify release flow

Merge request reports

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