Thread `sealed` from the manifest through to the DB column:
- manifest: `sealed` on ManifestRoute + the four event-kind trigger specs
(Kv/Docs/Files/Pubsub), flowing to Bundle via serde.
- persist: NewRoute.sealed + insert_route_tx; insert_trigger_tx `sealed`
param; the reconcile passes br.sealed / bt.sealed().
- validate_bundle_for rejects `sealed` on an app owner (meaningless — an
app route/trigger is never inherited).
- diff: `sealed` joins the route Update comparison and the trigger identity
(both bundle + current sides), so toggling it re-applies rather than NoOp.
`sealed` lives on shared Route + manager-core Trigger (both pure DTOs) so
the diff can see the current value; RouteRow/TriggerRow default it so
RETURNING clauses that omit it still hydrate. No runtime read effect yet —
the two suppression gates land in M3.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>