Add concurrency caps, the two-pane web UI, AGENTS.md, and plan status

internal/store/store.go

@@ -113,6 +113,15 @@ CREATE TABLE inbox_responses (
 );
 
 CREATE INDEX inbox_responses_item ON inbox_responses(item_id, created_at);
+`, `
+CREATE INDEX events_task ON events(task_id, seq);
+`, `
+CREATE TABLE turn_queue (
+	session_id TEXT PRIMARY KEY REFERENCES agent_sessions(id),
+	actor TEXT NOT NULL,
+	text TEXT NOT NULL,
+	created_at TEXT NOT NULL
+);
 `}
 
 type Store struct {
@@ -335,6 +344,21 @@ func (s *Store) EventsAfter(ctx context.Context, after int64, limit int) ([]api.
 	if err != nil {
 		return nil, err
 	}
+	return scanEvents(rows)
+}
+
+func (s *Store) TaskEvents(ctx context.Context, taskID string, after int64, limit int) ([]api.Event, error) {
+	rows, err := s.db.QueryContext(ctx, `
+		SELECT seq, kind, project_id, task_id, agent_session_id, actor, payload, created_at
+		FROM events WHERE task_id = ? AND seq > ? ORDER BY seq LIMIT ?
+	`, taskID, after, limit)
+	if err != nil {
+		return nil, err
+	}
+	return scanEvents(rows)
+}
+
+func scanEvents(rows *sql.Rows) ([]api.Event, error) {
 	defer rows.Close()
 
 	events := []api.Event{}