fix: use directory-aware client for delete, rename, command, permissions, questions

- sessions.ts: deleteSession looks up session.directory and uses clientFor()
  instead of bare client, so cross-project deletes hit the right server path
- index.tsx: submitRename uses clientForDirectory(session.directory) so renames
  work for sessions not owned by the active project directory
- index.tsx: handleSwitchDirectory calls catalog.load() after a directory switch
  so agents/commands/providers refresh for the new project
- session/[id].tsx: introduce sessionClient (directory-aware) and use it in
  handlePermissionReply, handleQuestionReply, handleQuestionReject, slash-command
  send, and the refreshPending bootstrap call; also add 'directory' to useEffect deps
- catalog.ts: remove debug console.log

src/stores/catalog.ts

@@ -85,16 +85,6 @@ export const useCatalog = create<CatalogState>((set, get) => ({
           .filter((p) => p.models.length > 0)
       : []
 
-    console.log(
-      "[catalog] loaded:",
-      agents.length,
-      "agents,",
-      commands.length,
-      "commands,",
-      providers.length,
-      "providers (" + providers.reduce((n, p) => n + p.models.length, 0) + " models)",
-    )
-
     // Filter out hidden agents
     const visible = agents.filter((a) => !a.hidden)