feat: per host layout for the terminal panel bar

packages/plugin-sdk/CHANGELOG.md

@@ -6,6 +6,7 @@ Plugin API 1.10.0.
 
 ### Added
 
+- `app.registerCompanionLayout` and `useCompanions`, so a plugin can let each host turn the panel bar on or off, move it and choose which panels show and in what order
 - `clientCert` on the sync link, link patch and remote target, and the `client_cert` remote error kind, so a sync plugin can link to a server that needs mutual TLS
 
 ## 1.0.17