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/extension.ts

@@ -608,6 +608,20 @@ export async function activate(context: vscode.ExtensionContext) {
             if (!provider) return;
             await provider._openArchitectureDoc();
         }),
+        // Re-resolve the active subproject when the user switches between files
+        // in different subfolders. Debounced so rapid editor flicks don't churn
+        // the chip / watcher. The actual resync is idempotent — if the active
+        // subproject didn't change, nothing visible happens.
+        (() => {
+            let timer: NodeJS.Timeout | undefined;
+            return vscode.window.onDidChangeActiveTextEditor(() => {
+                if (!provider) return;
+                if (timer) clearTimeout(timer);
+                timer = setTimeout(() => {
+                    provider!._sendArchitectureStatus().catch(() => { /* swallow — chip is best-effort */ });
+                }, 400);
+            });
+        })(),
         // ── 1인 기업 (Company) Mode commands ──────────────────────────────────
         // Thin shells over sidebar-provider methods so the runtime owns all
         // state mutation (chip status, watcher lifecycle, agent persistence).