`get` can fetch any trigger by id, including a group-owned TEMPLATE. It
omitted `group_id` and leaned on `#[sqlx(default)]`, so a template would
hydrate with both owners None — silently breaking the exactly-one-owner
invariant in memory. No caller hits this today (interactive trigger
management is app-scoped; prune deletes by id), but the fetch now
round-trips the owner faithfully and stays honest for future callers.
`list_for_app` is left as-is: its rows are all app-owned, so group_id is
legitimately NULL there.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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