feat: implement PI core chat timeline

src/types/coding-conversation.ts

@@ -1,9 +1,11 @@
 export type {
   CodingRuntimePublicError,
+  CodingConversationPatchBatchEvent,
   ConversationMessageNode,
   ConversationModelState,
   ConversationNode,
   ConversationPatch,
+  ConversationPatchBatchItem,
   ConversationPatchEnvelope,
   ConversationQueueState,
   ConversationRunState,
@@ -17,7 +19,7 @@ export type {
 } from '../../shared/coding-conversation-contracts';
 
 import type {
-  ConversationPatchEnvelope,
+  CodingConversationPatchBatchEvent,
   ConversationSnapshot,
   PromptMode,
 } from '../../shared/coding-conversation-contracts';
@@ -30,13 +32,9 @@ export interface CodingConversationSnapshotEvent {
   snapshot: ConversationSnapshot;
 }
 
-export type CodingConversationPatchEvent = {
-  type: 'patch';
-} & ConversationPatchEnvelope;
-
 export type CodingConversationStreamEvent =
   | CodingConversationSnapshotEvent
-  | CodingConversationPatchEvent;
+  | CodingConversationPatchBatchEvent;
 
 export interface CodingDraftAttachment {
   attachmentId: string;

src/types/coding-project.ts

@@ -0,0 +1,7 @@
+export type {
+  CodingConversationMetadata,
+  CodingProjectAgent,
+  CodingProjectConfig,
+  CodingProjectConfigSnapshot,
+  CodingProjectSummary,
+} from '../../shared/coding-project-contracts';