The M5.5 shared-group-secret work made a [group] [[triggers.email]] template
parse successfully (it materializes per descendant app; the inbound secret is
resolved against the group's own store server-side at apply). The unit test
still asserted the old parse-time rejection and had been failing on main under
`cargo test --workspace`. Update it to assert the current behavior: parse
accepts a group email template, like the group cron template above it.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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