v0.7.1 — the guide now says where the blocks go

Fixed

• The guide now says where the blocks go. It stopped at "here is valid markup", leaving an
  agent holding correct output with no instruction on what to do with it — so a request like
  "add a pricing section to my site" ended in improvisation. GUIDE.md §5 covers the three
  endings: write it where the user asked, offer to write it through an available WordPress
  connection, or show it with the paste instruction. Including the one users get wrong —
  block markup must go into the Code editor (Ctrl+Shift+Alt+M), not the visual editor,
  which turns it into a mess and reads as the tool being broken.

No code changes; the CLI and library are identical to 0.7.0.