I always thought my problem was my notes being scattered and disorganized. But reading this post made me realize something. I don't need better organization for the random links or braindumps I collect over time. Because I rarely actively revisit them. Usually That happens thanks to reminders, or when I need references for something I can't find anywhere else. So I think your action engine idea is sound.

To answer your questions:

1. Retrieval. 90% of my notes never get touched the second time, and I can't remember them at the right time.

2. On my head + a simple task list I made.

3. Hallucinations and pricing.