ci(fleet): centralize trunk config and gate release tags

[JSONbored]

Summary

• consume the shared unraid-aio Trunk plugin config
• only emit immutable release tags on real release commits
• document the publish and release tag behavior

Validation

• trunk check --show-existing --all
• python3 scripts/validate-template.py
• pytest tests/unit tests/template
• pytest tests/integration -m integration
• ./trunk-analytics-cli validate --junit-paths "reports/pytest-unit.xml,reports/pytest-integration.xml"
• git diff --check

[chatgpt-codex-connector]

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