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/provider-auth-domain.ts

@@ -0,0 +1,34 @@
+import type { ProviderAuthType } from "./domain";
+
+export interface ProviderAuthProfileRecord {
+  id: string;
+  orgId: string;
+  providerId: string;
+  credentialId: string;
+  providerKey: string;
+  authType: ProviderAuthType;
+  profileKind: string;
+  displayHint: string;
+  sourceType: string;
+  sourceRef: string | null;
+  capabilityJson: string;
+  active: boolean;
+  createdAt: string;
+}
+
+export interface ProviderAuthSessionRecord {
+  id: string;
+  orgId: string;
+  providerId: string;
+  providerKey: string;
+  employeeId: string;
+  state: string;
+  nonce: string;
+  codeVerifierSha256: string;
+  redirectUri: string;
+  signInUrl: string;
+  partition: string;
+  createdAt: string;
+  expiresAt: string;
+  completedAt: string | null;
+}