Keep Pass history immutable and replenish atomic with decisions

Fixes the three review findings on 50399b6 (pull request #102):

- A batch now rereads every declined name inside its storing transaction,
  so a Pass committed after the batch read its input but before it stores
  can no longer let the passed dish into the deck (SQ-01).
- A decision that leaves the deck under five creates the replenish batch
  and its job in the decision's own transaction, so a decision is never
  recorded without the replenish it calls for; when they cannot be
  written, neither is the decision, and a retry decides again (SQ-02).
  StartBatch commits the batch with its job the same way, replacing the
  mutex and the fail-on-enqueue cleanup. jobs gains Kind.EnqueueTx and
  Kind.Wake for this.
- Migration 0012 gives each suggestion the name its dish was suggested
  under; declined names for batches and the household context's passed
  list read it instead of the dinner's mutable name, so renaming a passed
  dinner no longer erases it from dedupe (SQ-03).

Task: b4f2558c-227f-4627-852b-be5aa190242a

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

internal/jobs/jobs.go

@@ -259,6 +259,21 @@ func (k *Kind[P]) Enqueue(ctx context.Context, payload P) (string, error) {
 	return k.r.enqueue(ctx, k.name, data)
 }
 
+// EnqueueTx stores a queued job with payload in tx and returns its id, so
+// the job exists exactly when what else tx writes does. Once tx has
+// committed, call Wake so an idle worker runs it.
+func (k *Kind[P]) EnqueueTx(ctx context.Context, tx *sql.Tx, payload P) (string, error) {
+	data, err := json.Marshal(payload)
+	if err != nil {
+		return "", fmt.Errorf("jobs: enqueue %s: encode payload: %w", k.name, err)
+	}
+	return createJob(ctx, db.New(tx), k.name, data)
+}
+
+// Wake tells an idle worker to look for a job, as Enqueue does itself:
+// call it after committing the transaction a job was enqueued in.
+func (k *Kind[P]) Wake() { k.r.wakeOne() }
+
 // Enqueue stores a queued job of kind with its JSON payload and returns its
 // id, as Kind.Enqueue does for a kind known at compile time. It returns
 // ErrUnknownKind for a kind with no registered handler and
@@ -280,9 +295,20 @@ func (r *Runner) Enqueue(ctx context.Context, kind string, payload json.RawMessa
 // enqueue stores a queued job of kind with its encoded payload and wakes a
 // worker.
 func (r *Runner) enqueue(ctx context.Context, kind string, payload []byte) (string, error) {
+	id, err := createJob(ctx, db.New(r.st.Writer), kind, payload)
+	if err != nil {
+		return "", err
+	}
+	r.wakeOne()
+	return id, nil
+}
+
+// createJob stores a queued job of kind with its encoded payload through q
+// and returns its id.
+func createJob(ctx context.Context, q *db.Queries, kind string, payload []byte) (string, error) {
 	id := store.NewID()
 	now := store.Now().String()
-	if err := db.New(r.st.Writer).CreateJob(ctx, db.CreateJobParams{
+	if err := q.CreateJob(ctx, db.CreateJobParams{
 		ID:        id,
 		Kind:      kind,
 		Payload:   string(payload),
@@ -291,11 +317,15 @@ func (r *Runner) enqueue(ctx context.Context, kind string, payload []byte) (stri
 	}); err != nil {
 		return "", fmt.Errorf("jobs: enqueue %s: %w", kind, err)
 	}
+	return id, nil
+}
+
+// wakeOne gives an idle worker a token to look for a queued job.
+func (r *Runner) wakeOne() {
 	select {
 	case r.wake <- struct{}{}:
 	default: // every worker already has a token and will look again
 	}
-	return id, nil
 }
 
 // Start fails every job a previous process left running with

internal/jobs/jobs_test.go

@@ -187,6 +187,46 @@ func TestJobSucceeds(t *testing.T) {
 	}
 }
 
+func TestEnqueueTxStoresJobOnlyWithItsTransaction(t *testing.T) {
+	t.Parallel()
+	st := migratedStore(t)
+	r := newRunner(t, st, 1)
+	count := register(t, r, "count", func(_ context.Context, p countPayload, _ func(countResult) error) (countResult, error) {
+		return countResult{Done: p.Steps}, nil
+	})
+	start(t, r)
+	ctx := context.Background()
+
+	var rolledBack string
+	refused := errors.New("refused")
+	if err := st.WithTx(ctx, func(tx *sql.Tx) error {
+		var err error
+		rolledBack, err = count.EnqueueTx(ctx, tx, countPayload{Steps: 1})
+		if err != nil {
+			return err
+		}
+		return refused
+	}); !errors.Is(err, refused) {
+		t.Fatalf("WithTx = %v, want the refusal", err)
+	}
+	if _, err := r.Get(ctx, rolledBack); !errors.Is(err, ErrNotFound) {
+		t.Errorf("job of a rolled-back transaction: Get = %v, want ErrNotFound", err)
+	}
+
+	var id string
+	if err := st.WithTx(ctx, func(tx *sql.Tx) error {
+		var err error
+		id, err = count.EnqueueTx(ctx, tx, countPayload{Steps: 2})
+		return err
+	}); err != nil {
+		t.Fatal(err)
+	}
+	count.Wake()
+	if job := waitFor(t, r, id, finished); job.Status != StatusSucceeded || string(job.Result) != `{"done":2}` {
+		t.Errorf("job = %+v (result %s), want succeeded with {\"done\":2}", job, job.Result)
+	}
+}
+
 func TestJobFailsWithFailureCode(t *testing.T) {
 	t.Parallel()
 	st := migratedStore(t)