feat: @mosaic/coord — migrate from v0, gateway integration (P2-005) (#77)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/gateway/src/coord/coord.dto.ts

@@ -0,0 +1,49 @@
+export interface CoordMissionStatusDto {
+  mission: {
+    id: string;
+    name: string;
+    status: string;
+    projectPath: string;
+  };
+  milestones: {
+    total: number;
+    completed: number;
+    current?: {
+      id: string;
+      name: string;
+      status: string;
+    };
+  };
+  tasks: {
+    total: number;
+    done: number;
+    inProgress: number;
+    pending: number;
+    blocked: number;
+    cancelled: number;
+  };
+  nextTaskId?: string;
+  activeSession?: {
+    sessionId: string;
+    runtime: string;
+    startedAt: string;
+  };
+}
+
+export interface CoordTaskDetailDto {
+  missionId: string;
+  task: {
+    id: string;
+    title: string;
+    status: string;
+    milestone?: string;
+    pr?: string;
+    notes?: string;
+  };
+  isNextTask: boolean;
+  activeSession?: {
+    sessionId: string;
+    runtime: string;
+    startedAt: string;
+  };
+}