Add structured memory system for persistent agent context

Implements `StructuredMemoryManager` to track conversation summaries,
user preferences, and learned facts across sessions. Includes:
- Configurable storage limits with automatic enforcement
- Heuristic extraction of preferences and facts from messages
- Memory context injection into system prompts
- Full test coverage for all manager operations

src/chat-view.ts

@@ -25,6 +25,7 @@ import {
 } from './types';
 import { ConversationStateManager } from './conversation-state';
 import { ErrorHandler } from './error-handler';
+import { StructuredMemoryManager } from './structured-memory';
 
 export const VIEW_TYPE_OLLAMA_CHAT = 'ollama-chat-view';
 
@@ -42,7 +43,12 @@ export class ChatView extends ItemView {
     return this.newChatButtonClickHandler;
   }
 
-  constructor(leaf: WorkspaceLeaf, settings: PluginSettings, vectorStore?: VaultVectorStore) {
+  constructor(
+    leaf: WorkspaceLeaf,
+    settings: PluginSettings,
+    vectorStore?: VaultVectorStore,
+    structuredMemoryManager?: StructuredMemoryManager
+  ) {
     super(leaf);
     this.messages = [];
     this.lastMessageEl = null;
@@ -70,6 +76,7 @@ export class ChatView extends ItemView {
     this.actionPreviewBuilder = new ActionPreviewBuilder(this.app.vault, this.app);
     this.noteContextBuilder = new NoteContextBuilder(this.app.vault, this.app, this.vaultIndexer);
     this.conversationStateManager = new ConversationStateManager();
+    this.structuredMemoryManager = structuredMemoryManager;
     this.workflowEngine = new WorkflowEngine(
       this.app.vault,
       this.app,
@@ -380,7 +387,6 @@ export class ChatView extends ItemView {
 
   getTools(): OllamaTool[] {
     const allTools: OllamaTool[] = [
-
       {
         type: 'function',
         function: {
@@ -600,17 +606,30 @@ export class ChatView extends ItemView {
 
   buildMessages(userMessageContent: string, tools?: OllamaTool[]): OllamaMessage[] {
     const systemContent = getSystemPromptForMode(this.currentAgentMode);
-    const systemMessage: OllamaMessage = {
+    const messages: OllamaMessage[] = [];
+
+    // Inject structured memory as a preceding system message if available
+    if (this.structuredMemoryManager) {
+      const memoryContext = this.structuredMemoryManager.buildMemoryContext();
+      if (memoryContext) {
+        messages.push({
+          role: 'system',
+          content: memoryContext,
+        });
+      }
+    }
+
+    messages.push({
       role: 'system',
       content: systemContent,
-    };
+    });
 
     const userMessage: OllamaMessage = {
       role: 'user',
       content: userMessageContent,
     };
 
-    const messages: OllamaMessage[] = [systemMessage, userMessage];
+    messages.push(userMessage);
 
     if (tools && tools.length > 0) {
       messages.push({
@@ -1059,6 +1078,38 @@ export class ChatView extends ItemView {
         content: fullResponse,
       });
 
+      // Update structured memory with preferences, facts, and a conversation summary
+      if (this.structuredMemoryManager) {
+        const prefs = this.structuredMemoryManager.extractPreferencesFromMessage(userMessage);
+        for (const pref of prefs) {
+          this.structuredMemoryManager.addUserPreference(pref);
+        }
+
+        const facts = this.structuredMemoryManager.extractFactsFromMessage(userMessage);
+        for (const fact of facts) {
+          this.structuredMemoryManager.addLearnedFact(fact);
+        }
+
+        // Also extract from assistant response
+        const assistantFacts = this.structuredMemoryManager.extractFactsFromMessage(fullResponse);
+        for (const fact of assistantFacts) {
+          this.structuredMemoryManager.addLearnedFact(fact);
+        }
+
+        const { topic, keyPoints } = this.structuredMemoryManager.summarizeConversation(
+          this.conversationStateManager.getShortTermContext()
+        );
+        if (keyPoints.length > 0) {
+          this.structuredMemoryManager.addConversationSummary({
+            id: crypto.randomUUID?.() ?? `summary-${Date.now()}-${Math.random()}`,
+            timestamp: Date.now(),
+            topic,
+            summary: keyPoints.join('; ').slice(0, 300),
+            keyPoints,
+          });
+        }
+      }
+
       // Limit conversation history to prevent memory issues
       if (this.messages.length > this.settings.maxMessageHistory) {
         this.messages = this.messages.slice(-this.settings.maxMessageHistory);
@@ -1100,6 +1151,7 @@ export class ChatView extends ItemView {
   private noteContextBuilder: NoteContextBuilder;
   private workflowEngine: WorkflowEngine;
   private conversationStateManager: ConversationStateManager;
+  private structuredMemoryManager?: StructuredMemoryManager;
   private vectorStore?: VaultVectorStore;
 
   private modeSelectorEl: HTMLSelectElement | null = null;