Consolidate task location: always .automaton/tasks/

Both framework and project tasks now live in .automaton/tasks/.
Every project has a .automaton/ directory, so no need for special
scope-based path logic. Removed the dual-convention gap.

Changes:
- Dashboard _find_tasks_dir() and _get_review_path() always use
  {root}/.automaton/tasks/ — no scope branching
- migrate-project.sh: moves tasks/ -> .automaton/tasks/ during upgrade
- Orchestrator prompt: all task path references updated to
  {project}/.automaton/tasks/

scripts/migrate-project.sh

@@ -107,16 +107,18 @@ while IFS= read -r -d '' project_file; do
   fi
 done < <(find "$PROJECT_AUTOMATON" -maxdepth 1 -type f -name "*.md" -o -name "*.sh" -print0 2>/dev/null || true)
 
-# Task directory — old model stored tasks in .automaton/tasks/, new model uses tasks/
-OLD_TASKS="$PROJECT_AUTOMATON/tasks"
-NEW_TASKS="$PROJECT_DIR/tasks"
-if [ -d "$OLD_TASKS" ] && [ ! -e "$NEW_TASKS" ]; then
-  echo "  MOVING   .automaton/tasks/ → tasks/ (tasks should be at project root)"
-  mv "$OLD_TASKS" "$NEW_TASKS"
-  MOVED+=(".automaton/tasks/ -> tasks/")
-elif [ -d "$OLD_TASKS" ] && [ -d "$NEW_TASKS" ]; then
-  echo "  NOTICE   Both .automaton/tasks/ and tasks/ exist — keeping both"
-  KEPT+=(".automaton/tasks/ and tasks/")
+# Task directory — tasks always live in .automaton/tasks/ for all modes
+ROOT_TASKS="$PROJECT_DIR/tasks"
+AUTOMATON_TASKS="$PROJECT_AUTOMATON/tasks"
+if [ -d "$ROOT_TASKS" ] && [ ! -e "$AUTOMATON_TASKS" ]; then
+  echo "  MOVING   tasks/ → .automaton/tasks/ (tasks belong in .automaton/)"
+  mv "$ROOT_TASKS" "$AUTOMATON_TASKS"
+  MOVED+=("tasks/ -> .automaton/tasks/")
+elif [ -d "$ROOT_TASKS" ] && [ -d "$AUTOMATON_TASKS" ]; then
+  echo "  MERGING  tasks/ contents into .automaton/tasks/"
+  cp -r "$ROOT_TASKS"/* "$AUTOMATON_TASKS/" 2>/dev/null || true
+  rm -rf "$ROOT_TASKS"
+  MOVED+=("tasks/ merged -> .automaton/tasks/")
 fi
 
 # Report