Protect production task database from tests and add migration

- Add TASK_TEST_MODE environment variable to use separate test database
- All file operations now use getTasksFilePath to respect test mode -
Tests use .tasks/tasks-test.jsonl instead of production database -
Add automatic migration from old task format (taskProject field)
to new format - Migrated tasks convert taskProject to WorkTask type
with empty parent - Old [Text] dependencies converted to [Dependency]
with Blocks type - Restore actual tasks from commit 3bf1691 (were
lost during testing)

This prevents accidental data loss when running tests and provides
backward compatibility for existing task databases.

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