Merge remote-tracking branch 'origin/master' into feat/web-message-feedback-ui

Adapt to two contract changes master introduced:

- The generated Remote face now wraps every business result in
  RemoteResult, folding carrier failures into an ok:false branch instead
  of rejecting. The controller reads that envelope at its three call
  sites and maps a carrier failure onto the same settled shape the
  controls already render; three specs cover the new branch.
- Client packages split their tsconfig into host and client halves, and
  the host aggregate now compiles any test not named *.client.spec.*.
  Rename this package's specs to the client convention and drop the
  ../connection project reference, which pointed at a solution file that
  no longer carries the client sources.

Keep master's mount loop with its rollback-on-failure in api-remotes and
add messageFeedbackRemote to it.

docs/subsystems/typert.md

@@ -66,6 +66,8 @@ interface InvocationParameterDescriptor {
   readonly lookup?: string
   /** Boundary codec for the wire representation. */
   readonly codec: TypeRTCodec
+  /** Missing wire fields decode to `undefined` only for an explicitly declared `T | undefined`. */
+  readonly acceptsUndefined?: true
 }
 ```
 
@@ -313,5 +315,5 @@ Resolve strict generated definitions or conservative SRC markers against current
 async invoke(request: InvokeRemoteRequest): Promise<unknown>
 ```
 
-Source: [`packages/api/gateway/src/index.ts:78`](../../packages/api/gateway/src/index.ts)
+Source: [`packages/api/gateway/src/index.ts:90`](../../packages/api/gateway/src/index.ts)
 <!-- END GENERATED cordis-surface -->