feat: Phase1 核心——模型/状态机 + SQLite Store(守卫+审批闸) + REST/WS API + daemon

- src/model: 复杂度分级、16 状态状态机、实体类型
- src/store: better-sqlite3 接 schema，transition 受 canTransition 守卫，
  decide 审批闸(reject 必带改进意见)，事件订阅广播，nextExecutable
- src/api: Fastify REST + ws 事件广播(/ws)
- src/daemon: maestrod 入口(env 配置，默认 ~/.maestro :4517)
- test: 9 个生命周期单测全过；typecheck/build 干净；REST+WS 端到端实跑验证

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

src/model/types.ts

@@ -0,0 +1,92 @@
+import type { Complexity } from './complexity.js';
+import type { TaskStatus, GateKind } from './status.js';
+
+export type Id = string;
+
+/** 层级上限：一般 ≤3 层，极复杂 ≤4 层 */
+export const DEFAULT_MAX_DEPTH = 3;
+export const HARD_MAX_DEPTH = 4;
+
+/** 自动执行边界（Easy 任务由后台执行器自动跑到什么程度） */
+export type Autonomy = 'manual' | 'auto-easy' | 'auto-approved';
+
+export interface Project {
+  id: Id;
+  name: string;
+  repoPath: string;
+  defaultBranch: string;
+  verifyCmd: string | null;       // 执行后的校验命令（build/test/lint）
+  autonomy: Autonomy;
+  model: string | null;
+  concurrency: number;            // 每项目并发执行上限
+  status: 'active' | 'paused';
+  createdAt: string;
+}
+
+export interface ApprovalRecord {
+  gate: GateKind;
+  action: 'accept' | 'reject';
+  actor: string;
+  reason: string | null;          // reject 必填（改进意见）
+  at: string;
+}
+
+export interface TaskResult {
+  branch: string | null;
+  worktree: string | null;
+  diffSummary: string | null;
+  commits: string[];
+  prUrl: string | null;
+}
+
+export interface Task {
+  id: Id;
+  projectId: Id;
+  parentId: Id | null;
+  depth: number;                  // 1..4
+  title: string;
+  complexity: Complexity;
+  status: TaskStatus;
+  priority: number;
+  deps: Id[];                     // 兄弟依赖（同层）
+  // 三选一产出（按复杂度）
+  plan: string | null;            // Hard：分析 + 拆解说明
+  spec: string | null;            // Medium：改动内容 + 为什么
+  operations: string | null;      // Easy：将执行的操作
+  approvals: ApprovalRecord[];
+  result: TaskResult | null;
+  assignee: 'agent' | 'human' | null;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export type RunKind = 'planner' | 'executor';
+export type RunStatus = 'started' | 'succeeded' | 'failed' | 'cancelled';
+
+export interface Run {
+  id: Id;
+  taskId: Id;
+  kind: RunKind;                  // planner（产出拆解/方案）| executor（执行改动）
+  worktree: string | null;
+  branch: string | null;
+  status: RunStatus;
+  startedAt: string;
+  endedAt: string | null;
+  transcriptRef: string | null;   // agent 转录日志文件路径
+  claudeSessionId: string | null;
+  error: string | null;
+}
+
+export type EventType =
+  | 'task.created' | 'task.updated' | 'status.changed'
+  | 'approval.requested' | 'approval.granted' | 'approval.rejected'
+  | 'run.started' | 'run.finished';
+
+export interface Event {
+  id: Id;
+  projectId: Id;
+  taskId: Id | null;
+  type: EventType;
+  payload: Record<string, unknown>;
+  at: string;
+}