`#5175` disabled the three Host rows (`time-context`, `schedule`,
`ui-schedule`) as a temporary stopgap and refreshed the Web fixtures for that
composition. Those rows and fixtures stay as master has them; this branch
keeps its preset ownership of the reminder stack, which takes effect when the
stopgap is lifted.
Resolutions:
- `packages/bundle/web-app/cordis.patch.yml` keeps master's `disabled: true`
on all three rows.
- The three presets declare the clock under `preset-time-context`: a row id
belongs to exactly one plane, and the Host row retains `time-context`.
- `apps/web/tests/schedule-after.e2e.ts`, `apps/web/tests/fixtures/
time-context-every-step.patch.yml`, `web-default-isolation.expected.e2e.ts`,
and the `minimal-preset` session fixture keep master's stopgap-era state.