fix(agents): cache bootstrap snapshots per session key

Co-authored-by: Isis Anisoptera <github@lotuswind.net>

src/agents/bootstrap-cache.ts

@@ -0,0 +1,25 @@
+import { loadWorkspaceBootstrapFiles, type WorkspaceBootstrapFile } from "./workspace.js";
+
+const cache = new Map<string, WorkspaceBootstrapFile[]>();
+
+export async function getOrLoadBootstrapFiles(params: {
+  workspaceDir: string;
+  sessionKey: string;
+}): Promise<WorkspaceBootstrapFile[]> {
+  const existing = cache.get(params.sessionKey);
+  if (existing) {
+    return existing;
+  }
+
+  const files = await loadWorkspaceBootstrapFiles(params.workspaceDir);
+  cache.set(params.sessionKey, files);
+  return files;
+}
+
+export function clearBootstrapSnapshot(sessionKey: string): void {
+  cache.delete(sessionKey);
+}
+
+export function clearAllBootstrapSnapshots(): void {
+  cache.clear();
+}