feat(architecture): add multi-subproject awareness and automatic context resync

- Implemented subproject root resolution based on active editor hint
- Added debounced event listener for active editor changes to trigger chip status updates
- Updated sidebar provider to re-resolve active subproject root on every chip build
- This ensures correct architecture context is injected when working in a monorepo or multi-root-style parent folder

src/sidebarProvider.ts

@@ -31,6 +31,7 @@ import {
     buildOrRefreshArchitectureDoc,
     architectureDocPathFor,
     formatArchitectureContextForPrompt,
+    resolveActiveSubprojectRoot,
     scanProject,
 } from './features/projectArchitecture';
 import { detectProjectIntent, KnownProject } from './features/projectArchitecture/intentDetector';
@@ -1217,8 +1218,14 @@ export class SidebarChatProvider implements vscode.WebviewViewProvider, BridgeIn
      * is free.
      */
     async _ensureActiveProjectForWorkspace(): Promise<ProjectProfile | null> {
-        const workspaceRoot = vscode.workspace.workspaceFolders?.[0]?.uri.fsPath;
-        if (!workspaceRoot) return null;
+        const wsRoot = vscode.workspace.workspaceFolders?.[0]?.uri.fsPath;
+        if (!wsRoot) return null;
+        // When the parent folder contains several subprojects, use the active
+        // editor's location to pick the *effective* subproject root instead of
+        // always reporting the parent.
+        const hint = vscode.window.activeTextEditor?.document.uri.fsPath
+            ?? vscode.window.visibleTextEditors[0]?.document.uri.fsPath;
+        const workspaceRoot = resolveActiveSubprojectRoot(wsRoot, hint);
         const projects = this._getChronicleProjects();
         const active = this._getActiveChronicleProject();
         const norm = (p: string | undefined) => (p || '').replace(/[\\/]+$/, '').toLowerCase();
@@ -2484,6 +2491,15 @@ export class SidebarChatProvider implements vscode.WebviewViewProvider, BridgeIn
                 logError('architecture: intent detection failed.', { error: e?.message ?? String(e) });
             }
         }
+        // Re-resolve the active subproject from the currently-focused editor.
+        // Without this, switching between subprojects (e.g. ConnectAI →
+        // Datacollector) inside one VS Code window keeps loading the previous
+        // subproject's architecture into the prompt.
+        try {
+            await this._ensureActiveProjectForWorkspace();
+        } catch (e: any) {
+            logError('architecture: workspace resync failed.', { error: e?.message ?? String(e) });
+        }
         const projectArchitectureContext = this._buildProjectArchitectureContext();
 
         // [File Processing v2] 파일 타입별 분류 처리