Fixes a spurious "changed" flag on any campaign without an explicit
template_id, which was re-syncing and re-previewing campaigns like
welcome/campaign.md on every unrelated push.
v0.1.4 fixes several bugs found while testing on twosquirrelspress-campaigns:
- test-send failed validation on empty name/messenger fields (v0.1.1, v0.1.2)
- campaigns went out HTML-only; listmonk never derives a plaintext
alternative on its own, so altbody is now sent explicitly (v0.1.3)
- change-detection now tracks altbody so campaigns synced before this
fix actually pick it up on their next sync (v0.1.4)
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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