feat: add external knowledge retrieval and cross-project activity

Connect Dify, FastGPT and RAGFlow through read-only bindings, encrypted local credentials, shared retrieval and persistent citations. Configuration and removal affect GoodBuddy only.

Show active conversations across projects, retain older live work, and improve project dialog scrolling. Queue concurrent questions and route managed SSH OpenCode questions through the Agent. Preserve recoverable read/search errors and partial search results.

Document the Electron UI automation standard, real model and external knowledge validation, and remaining acceptance limits.

Validation: earlier full regression passed 4081 tests with 66 skipped; subsequent focused remote-question checks and real Linux evidence are recorded in feature progress. Precommit typecheck and lint passed; latest project dialog and shared UI suites passed 58 tests. The full suite was not rerun for the final dialog changes.

Release note: Use external knowledge in conversations, find active work across projects, and answer concurrent local or managed SSH OpenCode questions. Managed SSH questions require the updated Agent adapter.

src/shared/contracts.ts

@@ -1308,6 +1308,7 @@ export type AgentEvent =
       requestId: string
       type: 'question'
       questionId: string
+      childTaskId?: string
       questions: Array<{
         header: string
         question: string
@@ -1319,6 +1320,11 @@ export type AgentEvent =
         custom: boolean
       }>
     }
+  | {
+      requestId: string
+      type: 'question-resolved'
+      questionId: string
+    }
   | {
       requestId: string
       type: 'artifact'
@@ -1633,6 +1639,8 @@ export const knowledgeRelationInputSchema = z
   .strict()
 
 export type KnowledgeLibrary = z.infer<typeof knowledgeCreateSchema> & {
+  kind?: 'local' | 'external'
+  external?: import('./external-knowledge-contracts').ExternalKnowledgeBinding
   id: string
   sourceCount: number
   documentCount: number
@@ -1717,9 +1725,11 @@ export type KnowledgeSnapshot = {
 }
 
 export type KnowledgeSearchReference = {
+  warnings?: string[]
+  external?: import('./external-knowledge-contracts').ExternalKnowledgeLocator
   libraryId: string
   libraryName: string
-  documentId: string
+  documentId?: string
   chunkId?: string
   documentName: string
   sourceName: string
@@ -2274,6 +2284,16 @@ export type DesktopApi = {
     onTodoStatusChanged: (listener: () => void) => () => void
   }
   knowledge: {
+    externalInstancesList: () => Promise<import('./external-knowledge-contracts').ExternalKnowledgeInstanceSummary[]>
+    externalInstancesSave: (input: import('./external-knowledge-contracts').ExternalKnowledgeInstanceSaveInput) => Promise<import('./external-knowledge-contracts').ExternalKnowledgeInstanceSummary>
+    externalInstancesTest: (input: {instanceId:string}) => Promise<import('./external-knowledge-contracts').ExternalKnowledgeInstanceSummary>
+    externalInstancesSetEnabled: (input: {instanceId:string;enabled:boolean}) => Promise<import('./external-knowledge-contracts').ExternalKnowledgeInstanceSummary>
+    externalInstancesDelete: (input: {instanceId:string}) => Promise<void>
+    externalCatalogList: (input: {instanceId:string;page?:number;pageSize?:number;parentId?:string|null;search?:string}) => Promise<import('./external-knowledge-contracts').ExternalKnowledgeCatalogPage>
+    externalCatalogGet: (input: {instanceId:string;remoteKnowledgeBaseId:string}) => Promise<import('./external-knowledge-contracts').ExternalKnowledgeCatalogItem>
+    externalBindingsCreate: (input: import('./external-knowledge-contracts').ExternalKnowledgeBindingSaveInput) => Promise<KnowledgeSnapshot>
+    externalBindingsUpdate: (input: import('./external-knowledge-contracts').ExternalKnowledgeBindingSaveInput & {knowledgeBaseId:string}) => Promise<KnowledgeSnapshot>
+    externalRetrievalTest: (input: import('./external-knowledge-contracts').ExternalKnowledgeBindingTestInput) => Promise<import('./external-knowledge-contracts').ExternalKnowledgeTestResult>
     getSnapshot: (libraryId?: string) => Promise<KnowledgeSnapshot>
     createLibrary: (
       input: z.infer<typeof knowledgeCreateSchema>