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/