feat: add bounded workflow decisions and durable result inbox

internal/storage/mysql/migrations/000017_workflow_result_inbox.up.sql

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+-- Weave内部结果保存独立快照，避免外部结果日志清理或任务后续核查改变历史输入。
+ALTER TABLE weave_inbox
+ ADD COLUMN source_task_id BINARY(16) NULL COMMENT '来源Pulse任务标识；仅迁移前无法核实的历史记录允许为空',
+ ADD COLUMN source_activation_id BINARY(16) NULL COMMENT '事件发生时的Weave激活标识，保留旧激活归属；仅未核实历史记录可空',
+ ADD COLUMN source_revision BIGINT UNSIGNED NULL COMMENT '来源任务的状态版本，必须大于零；仅未核实历史记录可空',
+ ADD COLUMN snapshot MEDIUMTEXT NULL COMMENT 'schema_version版本化结果JSON文本，保留精确数字与当时状态；仅未核实历史记录可空';
+
+-- 旧记录缺少冻结结果，不能用当前任务状态倒推历史并自动推进。
+UPDATE weave_inbox SET state='QUARANTINED',lease_owner=NULL,lease_until=NULL,
+ error_code='LEGACY_RESULT_UNVERIFIED',revision=revision+1,updated_at=UTC_TIMESTAMP(6)
+ WHERE state<>'PROCESSED';
+
+ALTER TABLE weave_inbox
+ ADD UNIQUE KEY uq_weave_task_result (namespace_id,source_task_id,source_revision),
+ ADD CONSTRAINT ck_weave_inbox_source CHECK (
+  (state IN ('PROCESSED','QUARANTINED') AND source_task_id IS NULL AND source_activation_id IS NULL AND source_revision IS NULL AND snapshot IS NULL)
+  OR (source_task_id IS NOT NULL AND source_activation_id IS NOT NULL AND source_revision IS NOT NULL AND source_revision>0 AND snapshot IS NOT NULL AND OCTET_LENGTH(snapshot)<=524288 AND JSON_VALID(snapshot))
+ );