diff --git a/@packages/@providers/profile-client/src/vendor.d.ts b/@packages/@providers/profile-client/src/vendor.d.ts
new file mode 100644
index 000000000..efbad591f
--- /dev/null
+++ b/@packages/@providers/profile-client/src/vendor.d.ts
@@ -0,0 +1,84 @@
+/**
+ * Ambient type declarations for @lilith/ui-dev-tools.
+ * Needed because the installed version in bun's module store may be missing src/.
+ * Source of truth: ~/Code/@packages/@ts/@ui-react/packages/ui-dev-tools/src/types.ts
+ */
+
+declare module '@lilith/ui-dev-tools' {
+  export interface DevUserTypeConfig {
+    id: string;
+    label: string;
+    emoji: string;
+    description: string;
+    exclusivePrimary?: boolean;
+  }
+
+  export interface StoredUserData {
+    types: string[];
+    primary: string | null;
+    userId: string | null;
+  }
+
+  export interface DevUserState {
+    userTypes: string[];
+    primaryType: string | null;
+    isAuthenticated: boolean;
+    hasDeclaredIntent: boolean;
+    displayName: string;
+    userId: string | null;
+  }
+
+  export interface PersonaProfile {
+    type: string;
+    completionPercentage: number;
+    status: 'draft' | 'active' | 'suspended';
+    displayName?: string;
+    verified?: boolean;
+  }
+
+  export interface DevUserPersona {
+    id: string;
+    name: string;
+    emoji: string;
+    description: string;
+    category: string;
+    userTypes: string[];
+    primaryType: string | null;
+    profiles?: PersonaProfile[];
+    metadata?: Record<string, unknown>;
+    pinned?: boolean;
+  }
+
+  export interface DevUserContextValue extends DevUserState {
+    addType: (typeId: string) => void;
+    removeType: (typeId: string) => void;
+    setPrimaryType: (typeId: string) => void;
+    toggleType: (typeId: string) => void;
+    hasType: (typeId: string) => boolean;
+    canBePrimary: (typeId: string) => boolean;
+    signOut: () => void;
+    signInAsDefault: () => void;
+    isDevMode: boolean;
+    userTypeConfigs: DevUserTypeConfig[];
+    getTypeConfig: (typeId: string) => DevUserTypeConfig | undefined;
+    personas: DevUserPersona[];
+    activePersona: DevUserPersona | null;
+    applyPersona: (personaId: string) => void;
+    clearPersona: () => void;
+  }
+
+  export interface DevUserProviderProps {
+    children: import('react').ReactNode;
+    userTypes: DevUserTypeConfig[];
+    storageKey: string;
+    personas?: DevUserPersona[];
+  }
+
+  export interface DevUserTypeSwitcherProps {
+    position?: 'bottom-left' | 'bottom-right';
+  }
+
+  export function useDevUser(): DevUserContextValue;
+  export function DevUserProvider(props: DevUserProviderProps): import('react').ReactElement;
+  export function DevUserTypeSwitcher(props: DevUserTypeSwitcherProps): import('react').ReactElement;
+}