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/commands/provider.ts

@@ -0,0 +1,81 @@
+import type { ProviderDataPolicy, ProviderExecutionMode } from "../domain";
+
+export interface SaveProviderCredentialInput {
+  orgId: string;
+  providerId: string;
+  secret: string;
+  model: string | null;
+  employeeId?: string | null;
+}
+
+export interface RevokeProviderCredentialInput {
+  orgId: string;
+  providerId: string;
+}
+
+export interface LaunchProviderSignInInput {
+  orgId: string;
+  providerId: string;
+  employeeId: string;
+}
+
+export interface StartProviderOAuthInput {
+  providerKey: string;
+  enterpriseDomain?: string | null;
+  /** Present when connecting an existing org's provider (Settings); absent
+   * during onboarding, where the obtained credential is returned to the caller. */
+  orgId?: string;
+  providerId?: string;
+  employeeId?: string;
+  model?: string | null;
+}
+
+export interface StartProviderOAuthResult {
+  /** The obtained credential JSON when no org context was supplied, else null
+   * (the credential was already stored). */
+  secret: string | null;
+}
+
+export interface CancelProviderOAuthInput {
+  providerKey: string;
+}
+
+export interface CheckProviderHealthInput {
+  orgId: string;
+  providerId: string;
+}
+
+export interface ListProviderModelsInput {
+  providerKey: string;
+  /** A just-typed/authorized credential (onboarding or the connect-new dialog). */
+  secret?: string;
+  /** A stored provider whose secret is decrypted server-side (settings refresh). */
+  orgId?: string;
+  providerId?: string;
+}
+
+export interface UpdateProviderPolicyInput {
+  orgId: string;
+  providerId: string;
+  dataPolicy: ProviderDataPolicy;
+  backgroundEnabled: boolean;
+  monthlyRequestLimit: number;
+  workspaceScope: "organization" | "workspace";
+}
+
+export interface CreateProviderResponseInput {
+  orgId: string;
+  providerId: string;
+  workspaceId?: string | null;
+  prompt: string;
+  instructions: string | null;
+  executionMode?: ProviderExecutionMode;
+}
+
+export type StreamProviderResponseInput = CreateProviderResponseInput;
+
+export interface CancelProviderResponseInput {
+  orgId: string;
+  requestId: string;
+  providerResponseId?: string;
+}