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.

packages/host/apiproxy/tests/client-handler.spec.ts

@@ -21,7 +21,6 @@ function scriptedApi(overrides: {
   sessions?: Partial<ApiProxy['sessions']>
   subagents?: Partial<ApiProxy['subagents']>
   host?: Partial<ApiProxy['host']>
-  commands?: Partial<ApiProxy['commands']>
   skills?: Partial<ApiProxy['skills']>
   agentPresets?: Partial<ApiProxy['agentPresets']>
   events?: Partial<ApiProxy['events']>
@@ -89,11 +88,6 @@ function scriptedApi(overrides: {
       insertSessionBefore: r => ok(r, { workspace: { workspaceId: 'w1' as never, path: '/t', title: 't', sessionIds: [], createdAt: '0', updatedAt: '0' } }),
       archiveSession: r => ok(r, { archivedSessionIds: [r.payload.sessionId] }),
     },
-    commands: {
-      list: r => ok(r, { commands: [] }),
-      execute: r => ok(r, { matched: false }),
-      ...overrides.commands,
-    },
     skills: { list: r => ok(r, { skills: [] }), ...overrides.skills },
     agentPresets: {
       list: r => ok(r, { presets: [], authorable: false, hasDocument: false }),