ci: remove workflow_call from publish for trusted publishing

[FBumann]

Summary

• Remove workflow_call trigger from publish workflow — PyPI trusted publishing doesn't work with reusable workflow calls
• Remove publish job from release workflow — release-please creates the tag via app token, which triggers publish directly via tag push
• Simplify ref handling (no more inputs.tag fallback)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 2a5777df-717c-4eb0-be5e-fc419f6657d9

📥 Commits

Reviewing files that changed from the base of the PR and between 3cb4827 and a6c891a.

📒 Files selected for processing (2)

• .github/workflows/publish.yaml
• .github/workflows/release.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/publish-tag-only

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