feat: component wiring integration — orphan cleanup, Memory page, WS handlers

Memory page: Added REST endpoints (routes/memory.ts, 3 GETs: list/daily/dreams),
React route in App.tsx, nav link in ProjectSidebar (Brain icon).

Orphan components wired: KeyboardShortcutsDialog (? key in AppShell),
McpResponseDisplay (MCP tool results in ToolCallLine), CacheShapeBadge
(StatsLine in MessageBubble). MessageBoundary + MessageListErrorBoundary
confirmed already wired in MarkdownRenderer/MessageList.

Dead code cleanup: useDraftPersistence integrated into ChatInput
(localStorage draft save/restore/clear on send). message-parts barrel
made canonical — MessageBubble imports from it; StatsLine updated with
CacheShapeBadge parity. api.settings.inference typed wrapper added;
InferenceSettings raw fetch replaced.

WS frame handlers: reasoning_delta (accumulates like delta), tool_trace_start,
tool_trace_finish, collision_warning, agent_message acknowledged in
useSessionStream. CollisionWarningEvent + AgentMessageEvent added to
sessionEvents union. Forwarding in useCoderUserEvents. reasoning_delta
+ collision_warning added to web WsFrame type. useSidebar default case
fixes pre-existing fallthrough error.

Workflow engine: services/workflow/index.ts documented as experimental;
coder flow-runner (apps/coder/src/services/flow-runner.ts) is canonical.

Verification: web type-check clean, server build clean, 627 tests pass.

apps/web/src/hooks/useSidebar.ts

@@ -202,6 +202,10 @@ function applyEvent(prev: SidebarResponse, event: import('./sessionEvents').Sess
     case 'battle_updated':
       // Consumed by useWorkspacePanes / ArenaPane / ArenaLauncherDialog; sidebar has no stake.
       return prev;
+    case 'collision_warning':
+    case 'agent_message':
+      // Published by BooCoder on the coder user channel; sidebar has no stake.
+      return prev;
     case 'project_archived': {
       const next = prev.projects.filter((p) => p.id !== event.project_id);
       if (next.length === prev.projects.length) return prev;
@@ -229,6 +233,8 @@ function applyEvent(prev: SidebarResponse, event: import('./sessionEvents').Sess
       });
       return changed ? { ...prev, projects } : prev;
     }
+    default:
+      return prev;
   }
 }