feat(db): 0013 tasks tables and 0014 agent_run_event; tasks uses db migrations

tasks_run_meta/tasks_fact/tasks_op_ledger move into packages/db (if not exists, old
tasks_migration tables dropped); packages/tasks/migrations and migrateTasksTables
removed, tests migrate their schema with @umt/db. agent_run_event(run_id, seq, type,
at, payload) with (run_id, seq) primary key; types regenerated, db-sync covers it.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

packages/db/migrations/0013_tasks_tables.ts

@@ -0,0 +1,60 @@
+import type { Kysely } from "kysely";
+import { dropTables, execDdl, oneOf } from "../src/migration-helpers.ts";
+
+// @umt/tasks 的三张自有表并入统一迁移(W1 审查 S2;原 packages/tasks/migrations/0001_tasks_tables)。
+// 表结构与原迁移一致,tasks 包通过注入的 Kysely 访问:
+// - tasks_run_meta:引擎 run 的业务侧元数据(traceId/优先级/取消标志),取消标志是 abortSignal 的来源
+// - tasks_fact:signal 之前先落库的事实;waitForFact 以它为准,信号只用来加速唤醒
+// - tasks_op_ledger:操作账本(fencing),记录 attempt_token,旧 attempt 的提交会被拒绝
+// 用 if not exists:W1 期间用 migrateTasksTables 建过表的库可以直接接管;顺手删掉旧的独立迁移记录表。
+
+// biome-ignore lint/suspicious/noExplicitAny: 迁移不依赖应用表类型
+export async function up(db: Kysely<any>): Promise<void> {
+  await execDdl(
+    db,
+    `
+create table if not exists tasks_run_meta (
+  run_id text primary key,
+  task_name text not null,
+  task_version integer not null,
+  idempotency_key text not null,
+  trace_id text,
+  priority integer not null default 0,
+  cancel_requested_at timestamptz,
+  cancel_reason text,
+  created_at timestamptz not null default now()
+);
+create index if not exists tasks_run_meta_task_idx on tasks_run_meta (task_name, created_at);
+
+create table if not exists tasks_fact (
+  id bigserial primary key,
+  run_id text not null,
+  name text not null,
+  payload jsonb,
+  created_at timestamptz not null default now()
+);
+create index if not exists tasks_fact_run_name_idx on tasks_fact (run_id, name, id);
+
+create table if not exists tasks_op_ledger (
+  op_key text primary key,
+  run_id text,
+  attempt_token uuid not null,
+  attempts integer not null default 1,
+  status text not null ${oneOf("status", ["started", "succeeded"])},
+  result jsonb,
+  last_error text,
+  started_at timestamptz not null default now(),
+  completed_at timestamptz
+);
+
+do $$ begin
+  execute format('drop table if exists %I.tasks_migration, %I.tasks_migration_lock', current_schema(), current_schema());
+end $$;
+`,
+  );
+}
+
+// biome-ignore lint/suspicious/noExplicitAny: 同上
+export async function down(db: Kysely<any>): Promise<void> {
+  await execDdl(db, dropTables(["tasks_op_ledger", "tasks_fact", "tasks_run_meta"]));
+}