autoresearch iter 22: delete lint suppressions that suppress nothing

24 of the 96 nolint directives were dead: they covered findings that no
longer exist. A stale suppression is not inert — it silently claims any
future finding for that linter in that scope, so a real problem raised
there would vanish without anyone noticing. Explanatory prose was kept as
ordinary comments.

Two directives proved load-bearing under the project gate even though
nolintlint reported them unused, and removing them exposed verified
contextcheck false positives: App.Run does forward a sigCtx derived from
the caller's context to Start, and the migration lock renewal must keep
its own deadline because the task context may already be canceled. Both
were restored, narrowed to the live linter, and given the reason the
originals lacked.

backend/plugins/drivers/driver_asynq_worker/meta.go

@@ -10,7 +10,7 @@ import (
 
 // TaskParam 任务参数定义
 //
-//nolint:revive // TaskParam 保留完整名称以避免与通用 Param 混淆
+// TaskParam 保留完整名称以避免与通用 Param 混淆
 type TaskParam struct {
 	Name        string `json:"name"`        // 参数键名
 	Label       string `json:"label"`       // 显示名称
@@ -22,7 +22,7 @@ type TaskParam struct {
 
 // TaskMeta 任务元数据
 //
-//nolint:revive // TaskMeta 保留完整名称以避免与通用 Meta 混淆
+// TaskMeta 保留完整名称以避免与通用 Meta 混淆
 type TaskMeta struct {
 	Type         string      `json:"type"`
 	AsynqTask    string      `json:"asynq_task"`