Stop reporting a blocker the task is no longer blocked on

F67. TaskCorrected cleared the standing question when a task resumed and
left Blocker and BlockReason in place, so task 29 ran through implement,
review and submission still reporting block_reason plan_mismatch. Every
surface that reads the projection rather than the event log showed a stop
that had already been answered.

The blocker has the same lifetime as the question beside it, and is now
cleared with it.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CVbaKucEYBjMqVeUgJUsc1

internal/store/store.go

@@ -588,8 +588,14 @@ func (s *Store) apply(e domain.Event) error {
 	// A question only stands while the task is blocked on it. Afterwards the
 	// answer is an ordinary standing decision and the log still holds the
 	// question, so keeping it on the task would put it in every later context.
+	//
+	// The blocker itself has the same lifetime and was outliving it (F67). A
+	// task resumed from a plan mismatch kept reporting block_reason
+	// plan_mismatch while it ran, so every surface reading the projection
+	// showed a stop that had already been answered.
 	if t.State != domain.StateBlocked {
 		t.DecisionRequest = nil
+		t.Blocker, t.BlockReason = "", ""
 	}
 	if phase, ok := p["lifecycle_phase"].(string); ok && phase != "" {
 		t.LifecyclePhase = phase