The scenario boots the shipped composition, which disables the Schedule
service and the clock, and the two reminder rows live inside
`preset-standard`. A top-level patch cannot address a plugin a preset
declares, so the spec builds its overlay from the shipped preset and restates
that row with `preset-time-context` and `tool-schedule` enabled, beside the
Host row enables. Directly created Agents mount the default preset so their
tool set comes from the product composition, and the shipped-roster assertion
covers both planes.
The static fixture is deleted: it restated only the Host rows.
Chinesezjc
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