fix(codex): bound prompt turn identity on registration

src/main/codex/codex-prompt-registry.ts

@@ -88,11 +88,12 @@ export class CodexPromptRegistry {
     if (optionAnswers === null) {
       return null
     }
+    const turnId = readString(request.params, 'turnId')
     const prompt: CodexPendingPrompt = {
       requestId: request.id,
       method: request.method,
       threadId,
-      turnId: readString(request.params, 'turnId'),
+      ...(turnId ? codexPromptTurnIdentity(turnId) : { turnId: null }),
       codexItemId,
       promptKey: readString(request.params, 'approvalId') ?? codexItemId,
       questionIds,

src/main/codex/codex-structured-prompt-replies.test.ts

@@ -138,6 +138,22 @@ describe('CodexPromptRegistry', () => {
     expect(registry.find('journal-root')).toBeNull()
   })
 
+  it('bounds an oversized request turn id and still clears its prompt', () => {
+    const registry = new CodexPromptRegistry()
+    const turnId = 'turn-'.padEnd(MAX_CODEX_PROMPT_REGISTRY_BYTES + 1, 'x')
+    const prompt = registry.register({
+      id: 1,
+      method: 'item/commandExecution/requestApproval',
+      params: { itemId: 'root-item', threadId: 'thread-1', turnId }
+    })
+
+    expect(prompt).not.toBeNull()
+    expect(registry.bytes).toBeLessThanOrEqual(MAX_CODEX_PROMPT_REGISTRY_BYTES)
+    registry.bindJournalItemId('journal-root', 'thread-1', 'root-item')
+    registry.clearTurn('thread-1', turnId)
+    expect(registry.find('journal-root')).toBeNull()
+  })
+
   it('addresses a prompt by its journal item id once bound, and forgets both', () => {
     const registry = new CodexPromptRegistry()
     const prompt = registry.register(userInputRequest(['q1']))