fix(jobs): 留痕清理独立接通历史存储开关；精简死逻辑并对齐陈旧注释

src/main/kotlin/com/gzzn/omms/msgexchange/infra/retry/ProcFailure.kt

@@ -20,8 +20,7 @@ class ProcFailure(
     private val procState: ProcStateRepository,
     val scheduler: FailureScheduler,
 ) {
-    /** @return 是否已经落到终态：DEAD 是终态，FAILED 还会再试 */
-    fun fail(head: ProcState, ec: ErrorClass, reason: String): Boolean {
+    fun fail(head: ProcState, ec: ErrorClass, reason: String) {
         val attempts = head.attempts + 1
         if (scheduler.exhausted(attempts)) {
             procState.markTerminal(
@@ -31,7 +30,6 @@ class ProcFailure(
                 lastError = "$reason; attempts=$attempts",
                 now = scheduler.now(),
             )
-            return true
         }
         procState.update(
             head.msgId, ProcStatus.FAILED,
@@ -40,6 +38,5 @@ class ProcFailure(
             errorClass = ec,
             lastError = reason,
         )
-        return false
     }
 }