feat: unified message architecture with provider adapters and session store

- Add provider adapter layer (server/providers/) with registry pattern
    - Claude, Cursor, Codex, Gemini adapters normalize native formats to NormalizedMessage
    - Shared types.js defines ProviderAdapter interface and message kinds
    - Registry enables polymorphic provider lookup

  - Add unified REST endpoint: GET /api/sessions/:id/messages?provider=...
    - Replaces four provider-specific message endpoints with one
    - Delegates to provider adapters via registry

  - Add frontend session-keyed store (useSessionStore)
    - Per-session Map with serverMessages/realtimeMessages/merged
    - Dedup by ID, stale threshold for re-fetch, background session accumulation
    - No localStorage for messages — backend JSONL is source of truth

  - Add normalizedToChatMessages converter (useChatMessages)
    - Converts NormalizedMessage[] to existing ChatMessage[] UI format

  - Wire unified store into ChatInterface, useChatSessionState, useChatRealtimeHandlers
    - Session switch uses store cache for instant render
    - Background WebSocket messages routed to correct session slot

server/claude-sdk.js

@@ -24,6 +24,8 @@ import {
   notifyRunStopped,
   notifyUserIfEnabled
 } from './services/notification-orchestrator.js';
+import { claudeAdapter } from './providers/claude/adapter.js';
+import { createNormalizedMessage } from './providers/types.js';
 
 const activeSessions = new Map();
 const pendingToolApprovals = new Map();
@@ -142,7 +144,7 @@ function matchesToolPermission(entry, toolName, input) {
  * @returns {Object} SDK-compatible options
  */
 function mapCliOptionsToSDK(options = {}) {
-  const { sessionId, cwd, toolsSettings, permissionMode, images } = options;
+  const { sessionId, cwd, toolsSettings, permissionMode } = options;
 
   const sdkOptions = {};
 
@@ -193,7 +195,7 @@ function mapCliOptionsToSDK(options = {}) {
   // Map model (default to sonnet)
   // Valid models: sonnet, opus, haiku, opusplan, sonnet[1m]
   sdkOptions.model = options.model || CLAUDE_MODELS.DEFAULT;
-  console.log(`Using model: ${sdkOptions.model}`);
+  // Model logged at query start below
 
   // Map system prompt configuration
   sdkOptions.systemPrompt = {
@@ -304,7 +306,7 @@ function extractTokenBudget(resultMessage) {
   // This is the user's budget limit, not the model's context window
   const contextWindow = parseInt(process.env.CONTEXT_WINDOW) || 160000;
 
-  console.log(`Token calculation: input=${inputTokens}, output=${outputTokens}, cache=${cacheReadTokens + cacheCreationTokens}, total=${totalUsed}/${contextWindow}`);
+  // Token calc logged via token-budget WS event
 
   return {
     used: totalUsed,
@@ -360,7 +362,7 @@ async function handleImages(command, images, cwd) {
       modifiedCommand = command + imageNote;
     }
 
-    console.log(`Processed ${tempImagePaths.length} images to temp directory: ${tempDir}`);
+    // Images processed
     return { modifiedCommand, tempImagePaths, tempDir };
   } catch (error) {
     console.error('Error processing images for SDK:', error);
@@ -393,7 +395,7 @@ async function cleanupTempFiles(tempImagePaths, tempDir) {
       );
     }
 
-    console.log(`Cleaned up ${tempImagePaths.length} temp image files`);
+    // Temp files cleaned
   } catch (error) {
     console.error('Error during temp file cleanup:', error);
   }
@@ -413,7 +415,7 @@ async function loadMcpConfig(cwd) {
       await fs.access(claudeConfigPath);
     } catch (error) {
       // File doesn't exist, return null
-      console.log('No ~/.claude.json found, proceeding without MCP servers');
+      // No config file
       return null;
     }
 
@@ -433,7 +435,7 @@ async function loadMcpConfig(cwd) {
     // Add global MCP servers
     if (claudeConfig.mcpServers && typeof claudeConfig.mcpServers === 'object') {
       mcpServers = { ...claudeConfig.mcpServers };
-      console.log(`Loaded ${Object.keys(mcpServers).length} global MCP servers`);
+      // Global MCP servers loaded
     }
 
     // Add/override with project-specific MCP servers
@@ -441,17 +443,14 @@ async function loadMcpConfig(cwd) {
       const projectConfig = claudeConfig.claudeProjects[cwd];
       if (projectConfig && projectConfig.mcpServers && typeof projectConfig.mcpServers === 'object') {
         mcpServers = { ...mcpServers, ...projectConfig.mcpServers };
-        console.log(`Loaded ${Object.keys(projectConfig.mcpServers).length} project-specific MCP servers`);
+        // Project MCP servers merged
       }
     }
 
     // Return null if no servers found
     if (Object.keys(mcpServers).length === 0) {
-      console.log('No MCP servers configured');
       return null;
     }
-
-    console.log(`Total MCP servers loaded: ${Object.keys(mcpServers).length}`);
     return mcpServers;
   } catch (error) {
     console.error('Error loading MCP config:', error.message);
@@ -541,13 +540,7 @@ async function queryClaudeSDK(command, options = {}, ws) {
       }
 
       const requestId = createRequestId();
-      ws.send({
-        type: 'claude-permission-request',
-        requestId,
-        toolName,
-        input,
-        sessionId: capturedSessionId || sessionId || null
-      });
+      ws.send(createNormalizedMessage({ kind: 'permission_request', requestId, toolName, input, sessionId: capturedSessionId || sessionId || null, provider: 'claude' }));
       emitNotification(createNotificationEvent({
         provider: 'claude',
         sessionId: capturedSessionId || sessionId || null,
@@ -569,12 +562,7 @@ async function queryClaudeSDK(command, options = {}, ws) {
           _receivedAt: new Date(),
         },
         onCancel: (reason) => {
-          ws.send({
-            type: 'claude-permission-cancelled',
-            requestId,
-            reason,
-            sessionId: capturedSessionId || sessionId || null
-          });
+          ws.send(createNormalizedMessage({ kind: 'permission_cancelled', requestId, reason, sessionId: capturedSessionId || sessionId || null, provider: 'claude' }));
         }
       });
       if (!decision) {
@@ -650,39 +638,35 @@ async function queryClaudeSDK(command, options = {}, ws) {
         // Send session-created event only once for new sessions
         if (!sessionId && !sessionCreatedSent) {
           sessionCreatedSent = true;
-          ws.send({
-            type: 'session-created',
-            sessionId: capturedSessionId
-          });
-        } else {
-          console.log('Not sending session-created. sessionId:', sessionId, 'sessionCreatedSent:', sessionCreatedSent);
+          ws.send(createNormalizedMessage({ kind: 'session_created', newSessionId: capturedSessionId, sessionId: capturedSessionId, provider: 'claude' }));
         }
       } else {
-        console.log('No session_id in message or already captured. message.session_id:', message.session_id, 'capturedSessionId:', capturedSessionId);
+        // session_id already captured
       }
 
-      // Transform and send message to WebSocket
+      // Transform and normalize message via adapter
       const transformedMessage = transformMessage(message);
-      ws.send({
-        type: 'claude-response',
-        data: transformedMessage,
-        sessionId: capturedSessionId || sessionId || null
-      });
+      const sid = capturedSessionId || sessionId || null;
+
+      // Use adapter to normalize SDK events into NormalizedMessage[]
+      const normalized = claudeAdapter.normalizeMessage(transformedMessage, sid);
+      for (const msg of normalized) {
+        // Preserve parentToolUseId from SDK wrapper for subagent tool grouping
+        if (transformedMessage.parentToolUseId && !msg.parentToolUseId) {
+          msg.parentToolUseId = transformedMessage.parentToolUseId;
+        }
+        ws.send(msg);
+      }
 
       // Extract and send token budget updates from result messages
       if (message.type === 'result') {
         const models = Object.keys(message.modelUsage || {});
         if (models.length > 0) {
-          console.log("---> Model was sent using:", models);
+          // Model info available in result message
         }
-        const tokenBudget = extractTokenBudget(message);
-        if (tokenBudget) {
-          console.log('Token budget from modelUsage:', tokenBudget);
-          ws.send({
-            type: 'token-budget',
-            data: tokenBudget,
-            sessionId: capturedSessionId || sessionId || null
-          });
+        const tokenBudgetData = extractTokenBudget(message);
+        if (tokenBudgetData) {
+          ws.send(createNormalizedMessage({ kind: 'status', text: 'token_budget', tokenBudget: tokenBudgetData, sessionId: capturedSessionId || sessionId || null, provider: 'claude' }));
         }
       }
     }
@@ -696,13 +680,7 @@ async function queryClaudeSDK(command, options = {}, ws) {
     await cleanupTempFiles(tempImagePaths, tempDir);
 
     // Send completion event
-    console.log('Streaming complete, sending claude-complete event');
-    ws.send({
-      type: 'claude-complete',
-      sessionId: capturedSessionId,
-      exitCode: 0,
-      isNewSession: !sessionId && !!command
-    });
+    ws.send(createNormalizedMessage({ kind: 'complete', exitCode: 0, isNewSession: !sessionId && !!command, sessionId: capturedSessionId, provider: 'claude' }));
     notifyRunStopped({
       userId: ws?.userId || null,
       provider: 'claude',
@@ -710,7 +688,7 @@ async function queryClaudeSDK(command, options = {}, ws) {
       sessionName: sessionSummary,
       stopReason: 'completed'
     });
-    console.log('claude-complete event sent');
+    // Complete
 
   } catch (error) {
     console.error('SDK query error:', error);
@@ -724,11 +702,7 @@ async function queryClaudeSDK(command, options = {}, ws) {
     await cleanupTempFiles(tempImagePaths, tempDir);
 
     // Send error to WebSocket
-    ws.send({
-      type: 'claude-error',
-      error: error.message,
-      sessionId: capturedSessionId || sessionId || null
-    });
+    ws.send(createNormalizedMessage({ kind: 'error', content: error.message, sessionId: capturedSessionId || sessionId || null, provider: 'claude' }));
     notifyRunFailed({
       userId: ws?.userId || null,
       provider: 'claude',