chore: report the debounce fix as a server change, not a package change

The only packages change here is JSDoc, so a changeset would file a
server-side behaviour fix under the core package changelog, where
upgrading the package does nothing for it.

Author: matt-aitken

.changeset/debounce-max-duration.md

@@ -0,0 +1,6 @@
+---
+area: webapp
+type: fix
+---
+
+Fix debounce doing nothing when the delay was longer than an hour, which made every trigger create its own run instead of collapsing onto the debounce key. Debounced runs now keep being pushed back for as long as triggers keep arriving, so set `maxDelay` when the work has to happen eventually, and settings that could never debounce are rejected rather than silently ignored.