feat: 品牌替换 + 启动优化 + AGENTS.md 模板定制

- 品牌替换：OpenCode/opencode → AirCoding/aircoding（16+ 文件）
- Logo ASCII art：修复 left/right 行数不匹配导致的启动崩溃
- 启动诊断：添加 OPENCODE_PRINT_TIMING 计时探针
- dev 模式默认 --pure 跳过外部插件加载
- AGENTS.md 模板：追加 AirCoding 多 Agent 专项段落
- architect prompt + plugin：强化 AGENTS.md 产出验证

packages/core/migration/20260323234822_events/migration.sql

@@ -0,0 +1,13 @@
+CREATE TABLE `event_sequence` (
+	`aggregate_id` text PRIMARY KEY,
+	`seq` integer NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE `event` (
+	`id` text PRIMARY KEY,
+	`aggregate_id` text NOT NULL,
+	`seq` integer NOT NULL,
+	`type` text NOT NULL,
+	`data` text NOT NULL,
+	CONSTRAINT `fk_event_aggregate_id_event_sequence_aggregate_id_fk` FOREIGN KEY (`aggregate_id`) REFERENCES `event_sequence`(`aggregate_id`) ON DELETE CASCADE
+);