Lifei/delete tauri backend acp (#8582)

Co-authored-by: Jack Amadeo <jackamadeo@squareup.com>

ui/goose2/scripts/check-file-sizes.mjs

@@ -26,19 +26,9 @@ const EXCEPTIONS = {
       "Search-as-you-type filtering and draft-aware sidebar highlight logic.",
   },
   "src/app/AppShell.tsx": {
-    limit: 640,
+    limit: 650,
     justification:
-      "Shell still coordinates ACP session loading, project reassignment, and app-level chat routing.",
-  },
-  "src/features/chat/hooks/useAcpStream.ts": {
-    limit: 580,
-    justification:
-      "ACP replay, streaming, session binding, model-state event handling, and replay timeout are still centralized here.",
-  },
-  "src/features/chat/hooks/__tests__/useAcpStream.test.ts": {
-    limit: 570,
-    justification:
-      "Covers replay buffering, timeout error state, streaming edge cases, and provider identity persistence in one cohesive suite.",
+      "Shell still coordinates ACP session loading, replay-buffer cleanup on load failure, project reassignment, and app-level chat routing.",
   },
   "src/features/chat/stores/__tests__/chatSessionStore.test.ts": {
     limit: 540,
@@ -55,21 +45,6 @@ const EXCEPTIONS = {
     justification:
       "Project CRUD plus reorder_projects command for sidebar drag-and-drop ordering.",
   },
-  "src-tauri/src/services/acp/manager/dispatcher.rs": {
-    limit: 540,
-    justification:
-      "ACP replay and live-stream event fan-out share one dispatcher with replay event counting for drain stabilisation.",
-  },
-  "src-tauri/src/services/acp/manager.rs": {
-    limit: 630,
-    justification:
-      "ACP manager command dispatch loop — export/import/fork session ext_method dispatch adds boilerplate.",
-  },
-  "src-tauri/src/services/acp/manager/session_ops.rs": {
-    limit: 620,
-    justification:
-      "Session prepare/load/list logic, working-dir updates, wait_for_replay_drain helper with iteration cap, and composite prepared-session reuse remain colocated while ACP session ownership stabilizes.",
-  },
   "src-tauri/src/commands/system.rs": {
     limit: 640,
     justification: