Promote AgentCompany-New to the repository root and retire the old app

The legacy application - its src, tests, landing site, promo assets, docs,
release tooling, CI workflows, and root configs - leaves the tree; it stays
reachable in history. Everything under AgentCompany-New moves up unchanged:
same package name, so the production userData/database path is untouched,
and e2e/build scripts already resolved paths relative to the project. The
developer cred.txt stays gitignored at its new location. Full verify:ci
passes from the new root.

src/shared/social-domain.ts

@@ -0,0 +1,84 @@
+import type { SocialPlatform } from "./domain";
+
+export interface SocialAccountRecord {
+  id: string;
+  orgId: string;
+  platform: SocialPlatform;
+  handle: string;
+  displayName: string;
+  authorizedEmployeeId: string | null;
+  createdAt: string;
+}
+
+export interface SocialAccountGrantRecord {
+  id: string;
+  orgId: string;
+  socialAccountId: string;
+  employeeId: string;
+  role: string;
+  scopeJson: string;
+  createdAt: string;
+}
+
+export interface BrowserSessionContainerRecord {
+  id: string;
+  orgId: string;
+  socialAccountId: string;
+  platform: SocialPlatform;
+  partitionKey: string;
+  hostAllowlistJson: string;
+  permissionPolicy: string;
+  sandboxEnabled: boolean;
+  createdAt: string;
+  lastUsedAt: string | null;
+}
+
+export interface BrowserActionPolicyRecord {
+  id: string;
+  orgId: string;
+  socialAccountId: string;
+  actionType: string;
+  contentCategory: string;
+  riskLevel: string;
+  approvalRequired: boolean;
+  approvalKind: string | null;
+  createdAt: string;
+}
+
+export interface SocialApprovalRouteRecord {
+  id: string;
+  orgId: string;
+  socialAccountId: string;
+  actionType: string;
+  riskLevel: string;
+  approvalKind: string;
+  routeToType: string;
+  routeToId: string | null;
+  createdAt: string;
+}
+
+export interface BrowserActionRecord {
+  id: string;
+  orgId: string;
+  socialAccountId: string;
+  actionType: string;
+  policyDecision: string;
+  evidenceFileId: string | null;
+  metadataJson: string;
+  createdAt: string;
+}
+
+export interface SocialAuditRecord {
+  id: string;
+  orgId: string;
+  socialAccountId: string | null;
+  sourceType: string;
+  sourceId: string | null;
+  eventType: string;
+  actorType: string;
+  actorId: string | null;
+  policyDecision: string;
+  evidenceFileId: string | null;
+  metadataJson: string;
+  createdAt: string;
+}