Review follow-ups on the echo-guard widening:
- setSearchState now trims too, so URL-sourced terms (deep links with
?q=Bein%20, actor/discover prefills passing raw provider titles) cannot
put an untrimmed term into appliedSearchQuery — previously that path
failed the echo guard's equality check, snapped the box, and dispatched
the portal search twice. Regression spec added.
- docs/architecture/workspace-shell.md item 8 updated: the applied-term
echo is now always ignored, not only while input is still debouncing.
- The facade spec's router mock exposes a mutable navigation trigger so
facade-level tests can exercise the popstate branch.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>