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-# Mail Manager - Interface Relationships
-
-This document visualizes all the interfaces in the mail_manager module and their relationships.
-
-## Overview
-
-The mail manager uses a hierarchical structure where interfaces are organized by their domain responsibilities:
-- **Common Types**: Base types and selectors
-- **Providers**: Mail service providers (Gmail, IMAP, etc.)
-- **Services**: Individual mail accounts/services
-- **Collections**: Mailboxes and folders
-- **Messages**: Email messages and their parts
-
----
-
-## Complete Interface Diagram
-
-```mermaid
-classDiagram
-    %% Common/Base Types
-    class SourceSelector {
-        +string provider
-        +string service
-        +string collection
-        +string message
-    }
-    
-    class ApiRequest~T~ {
-        +T data
-    }
-    
-    class ApiResponse~T~ {
-        +T data
-        +Error error
-    }
-    
-    class ListRange {
-        +number offset
-        +number limit
-    }
-
-    %% Provider Interfaces
-    class ProviderInterface {
-        +string @type
-        +string identifier
-        +string label
-        +ProviderCapabilitiesInterface capabilities
-    }
-    
-    class ProviderCapabilitiesInterface {
-        +boolean ServiceList
-        +boolean ServiceFetch
-        +boolean ServiceExtant
-        +boolean ServiceCreate
-        +boolean ServiceModify
-        +boolean ServiceDestroy
-        +boolean ServiceDiscover
-        +boolean ServiceTest
-    }
-    
-    class ProviderListRequest {
-        +SourceSelector sources
-    }
-    
-    class ProviderListResponse {
-        +ProviderInterface[identifier] providers
-    }
-    
-    class ProviderFetchRequest {
-        +string identifier
-    }
-    
-    class ProviderFetchResponse {
-        <<extends ProviderInterface>>
-    }
-    
-    class ProviderExtantRequest {
-        +SourceSelector sources
-    }
-    
-    class ProviderExtantResponse {
-        +boolean[identifier] exists
-    }
-
-    %% Service Interfaces
-    class ServiceInterface {
-        +string @type
-        +string identifier
-        +string provider
-        +string label
-        +ServiceCapabilitiesInterface capabilities
-        +object configuration
-    }
-    
-    class ServiceCapabilitiesInterface {
-        +boolean CollectionList
-        +boolean CollectionFetch
-        +boolean CollectionExtant
-        +boolean CollectionCreate
-        +boolean CollectionModify
-        +boolean CollectionDestroy
-    }
-    
-    class ServiceListRequest {
-        +SourceSelector sources
-        +ListRange range
-    }
-    
-    class ServiceListResponse {
-        +ServiceInterface[identifier] services
-    }
-    
-    class ServiceFetchRequest {
-        +string provider
-        +string identifier
-    }
-    
-    class ServiceFetchResponse {
-        <<extends ServiceInterface>>
-    }
-    
-    class ServiceExtantRequest {
-        +SourceSelector sources
-    }
-    
-    class ServiceExtantResponse {
-        +boolean[identifier] exists
-    }
-    
-    class ServiceCreateRequest {
-        +string provider
-        +string label
-        +object configuration
-    }
-    
-    class ServiceCreateResponse {
-        <<extends ServiceInterface>>
-    }
-    
-    class ServiceModifyRequest {
-        +string provider
-        +string identifier
-        +string label
-        +object configuration
-    }
-    
-    class ServiceModifyResponse {
-        <<extends ServiceInterface>>
-    }
-    
-    class ServiceDestroyRequest {
-        +string provider
-        +string identifier
-    }
-    
-    class ServiceDestroyResponse {
-        +boolean success
-    }
-
-    %% Collection Interfaces
-    class CollectionInterface {
-        +string @type
-        +string identifier
-        +string service
-        +string provider
-        +string label
-        +CollectionCapabilitiesInterface capabilities
-        +string[] flags
-        +number messageCount
-    }
-    
-    class CollectionCapabilitiesInterface {
-        +boolean MessageList
-        +boolean MessageFetch
-        +boolean MessageExtant
-        +boolean MessageCreate
-        +boolean MessageModify
-        +boolean MessageDestroy
-    }
-    
-    class CollectionListRequest {
-        +SourceSelector sources
-        +ListRange range
-    }
-    
-    class CollectionListResponse {
-        +CollectionInterface[identifier] collections
-    }
-    
-    class CollectionFetchRequest {
-        +string provider
-        +string service
-        +string identifier
-    }
-    
-    class CollectionFetchResponse {
-        <<extends CollectionInterface>>
-    }
-
-    %% Message Interfaces
-    class MessageInterface {
-        +string @type
-        +string identifier
-        +string collection
-        +string service
-        +string provider
-        +string[] flags
-        +Date receivedDate
-        +Date internalDate
-        +MessageHeadersInterface headers
-        +MessagePartInterface[] parts
-    }
-    
-    class MessageHeadersInterface {
-        +string from
-        +string[] to
-        +string[] cc
-        +string[] bcc
-        +string subject
-        +string messageId
-        +string[] references
-        +string inReplyTo
-        +Date date
-    }
-    
-    class MessagePartInterface {
-        +string partId
-        +string mimeType
-        +string filename
-        +number size
-        +MessagePartInterface[] subParts
-        +object headers
-        +string body
-    }
-    
-    class MessageListRequest {
-        +SourceSelector sources
-        +ListRange range
-        +string[] flags
-    }
-    
-    class MessageListResponse {
-        +MessageInterface[identifier] messages
-    }
-    
-    class MessageFetchRequest {
-        +string provider
-        +string service
-        +string collection
-        +string identifier
-    }
-    
-    class MessageFetchResponse {
-        <<extends MessageInterface>>
-    }
-
-    %% Relationships
-    ProviderInterface --> ProviderCapabilitiesInterface
-    ProviderFetchResponse --|> ProviderInterface
-    ProviderListResponse --> ProviderInterface
-    
-    ServiceInterface --> ServiceCapabilitiesInterface
-    ServiceFetchResponse --|> ServiceInterface
-    ServiceCreateResponse --|> ServiceInterface
-    ServiceModifyResponse --|> ServiceInterface
-    ServiceListResponse --> ServiceInterface
-    
-    CollectionInterface --> CollectionCapabilitiesInterface
-    CollectionFetchResponse --|> CollectionInterface
-    CollectionListResponse --> CollectionInterface
-    
-    MessageInterface --> MessageHeadersInterface
-    MessageInterface --> MessagePartInterface
-    MessagePartInterface --> MessagePartInterface : subParts
-    MessageFetchResponse --|> MessageInterface
-    MessageListResponse --> MessageInterface
-    
-    %% Selector Usage
-    ProviderListRequest --> SourceSelector
-    ProviderExtantRequest --> SourceSelector
-    ServiceListRequest --> SourceSelector
-    ServiceExtantRequest --> SourceSelector
-    CollectionListRequest --> SourceSelector
-    MessageListRequest --> SourceSelector
-```
-
----
-
-## Hierarchical Structure
-
-```mermaid
-graph TD
-    A[SourceSelector] --> B[Provider Level]
-    B --> C[Service Level]
-    C --> D[Collection Level]
-    D --> E[Message Level]
-    
-    B --> B1[ProviderInterface]
-    B --> B2[ProviderCapabilities]
-    
-    C --> C1[ServiceInterface]
-    C --> C2[ServiceCapabilities]
-    
-    D --> D1[CollectionInterface]
-    D --> D2[CollectionCapabilities]
-    
-    E --> E1[MessageInterface]
-    E --> E2[MessageHeaders]
-    E --> E3[MessagePart]
-```
-
----
-
-## Request/Response Pattern
-
-All operations follow a consistent request/response pattern:
-
-```mermaid
-sequenceDiagram
-    participant Client
-    participant API
-    participant Provider
-    
-    Client->>API: {Operation}Request
-    API->>Provider: Process Request
-    Provider->>API: Data
-    API->>Client: {Operation}Response
-```
-
-### Operations by Level:
-
-**Provider Level:**
-- List, Fetch, Extant
-
-**Service Level:**
-- List, Fetch, Extant, Create, Modify, Destroy
-
-**Collection Level:**
-- List, Fetch, Extant, Create, Modify, Destroy
-
-**Message Level:**
-- List, Fetch, Extant, Create, Modify, Destroy
-
----
-
-## Capability Inheritance
-
-```mermaid
-graph LR
-    A[ProviderCapabilities] -->|enables| B[ServiceCapabilities]
-    B -->|enables| C[CollectionCapabilities]
-    C -->|enables| D[Message Operations]
-```
-
-Capabilities cascade down the hierarchy - if a provider doesn't support `ServiceList`, then no services can be listed for that provider.
-
----
-
-## Key Patterns
-
-### 1. **Extends Pattern**
-Response interfaces extend their base interface:
-- `ProviderFetchResponse extends ProviderInterface`
-- `ServiceFetchResponse extends ServiceInterface`
-
-### 2. **Dictionary Pattern**
-List responses use identifier as key:
-```typescript
-{
-  [identifier: string]: Interface
-}
-```
-
-### 3. **SourceSelector Pattern**
-Resources are selected hierarchically:
-```typescript
-{
-  provider: "gmail",
-  service: "user@example.com",
-  collection: "INBOX",
-  message: "msg123"
-}
-```
-
-### 4. **Recursive Structure**
-MessagePart can contain subParts:
-```typescript
-MessagePartInterface {
-  subParts?: MessagePartInterface[]
-}
-```
-
----
-
-## Usage Examples
-
-### Selecting a specific message:
-```typescript
-const selector: SourceSelector = {
-  provider: "gmail",
-  service: "user@example.com",
-  collection: "INBOX",
-  message: "12345"
-};
-```
-
-### Listing all services for a provider:
-```typescript
-const request: ServiceListRequest = {
-  sources: {
-    provider: "gmail"
-  },
-  range: {
-    offset: 0,
-    limit: 50
-  }
-};
-```
-
----
-
-## Interface Files
-
-- `common.ts` - Base types and selectors
-- `provider.ts` - Provider-level interfaces
-- `service.ts` - Service-level interfaces
-- `collection.ts` - Collection-level interfaces
-- `message.ts` - Message-level interfaces