Honestly? Shadowrun is one of those games where you'll find out about a rule every session.
But page references for you:
Augmented Maximum: Page 94 under the Heading "Spending Your Resources," last paragraph.
Adept Powers that augment: Page 309 and 310.
You literally have to bounce back and forth between pages and read the paragraphs. If you have any questions about Moonlight Shadow's build, ask any of us. It's a solid build overall.