feat: bootstrap boss control plane prototype

src/store.ts

@@ -0,0 +1,61 @@
+import { existsSync, mkdirSync, readFileSync, writeFileSync } from "node:fs";
+import { dirname } from "node:path";
+import type { AppState } from "./types.js";
+
+function defaultState(): AppState {
+  return {
+    sessions: [],
+    messages: [],
+    tasks: [],
+    workers: [],
+    approvals: [],
+    events: [],
+  };
+}
+
+export class FileStore {
+  private state: AppState;
+
+  constructor(private readonly filePath: string) {
+    this.ensureDirectory();
+    this.state = this.load();
+  }
+
+  get snapshot(): AppState {
+    return structuredClone(this.state);
+  }
+
+  mutate<T>(mutator: (state: AppState) => T): T {
+    const result = mutator(this.state);
+    this.save();
+    return result;
+  }
+
+  reset(): AppState {
+    this.state = defaultState();
+    this.save();
+    return this.snapshot;
+  }
+
+  private ensureDirectory(): void {
+    mkdirSync(dirname(this.filePath), { recursive: true });
+  }
+
+  private load(): AppState {
+    if (!existsSync(this.filePath)) {
+      return defaultState();
+    }
+
+    try {
+      const raw = readFileSync(this.filePath, "utf8");
+      return { ...defaultState(), ...(JSON.parse(raw) as AppState) };
+    } catch {
+      return defaultState();
+    }
+  }
+
+  private save(): void {
+    writeFileSync(this.filePath, `${JSON.stringify(this.state, null, 2)}\n`, "utf8");
+  }
+}
+