fix(kernel): drop the steer-away hint after its first build, not just its first stage entry (#306)

bc5afa51 made unconfirmedFixEntries one-shot per RetryAttemptedEvent by folding
prior ContextAssembledEvent manifests. Correct, but it only guards the call
site — which runs ONCE per stage entry (SessionOrchestratorExecution.kt:250).
The entry it returns is folded into accumulatedEntries, and every pushBack /
tool-round rebuild rebuilds from that same list, so the hint rode along into
every turn of the stage regardless of the delivery fold. That is the reported
symptom: 7 consecutive turns in session d734e1de, one stage entry.

Drop sourceType=="unconfirmedFix" from accumulatedEntries once the first pack
is built and its delivery recorded. The fold still does the across-entries half.

./gradlew check green.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HgDL1v3GuQ9RZnYR6fDT95

core/kernel/src/main/kotlin/com/correx/core/kernel/orchestration/SessionOrchestratorExecution.kt

@@ -305,6 +305,11 @@ internal suspend fun SessionOrchestrator.executeStage(
     }
     emitContextTruncationIfNeeded(sessionId, stageId, contextPack)
     emitContextAssembled(sessionId, stageId, contextPack)
+    // #306, within-stage half: the delivery fold in unconfirmedFixEntries only runs at stage entry,
+    // so on its own it stops re-injection across ENTRIES, not across the turns of one entry — every
+    // pushBack rebuild re-uses accumulatedEntries and would carry the steer-away into all of them
+    // (7 consecutive turns, session d734e1de). It is one-shot by definition: drop it once delivered.
+    accumulatedEntries = accumulatedEntries.filterNot { it.sourceType == "unconfirmedFix" }
 
     var currentContext = contextPack
     var inferenceResult = runInference(