Twenty-one positions. Two exits each. One job at a time — climb exactly one rung.
Generated from gameplan/nodes/ by tools/build-data.sh. The markdown
in the repo stays the source of truth — edit a node, rebuild, republish.
Every position carries its decision layer: where you are, what your one job is, and the two
things you are allowed to try. The standing tier (N1–N4) is written
up in full; the rest are marked mechanics not written yet and are being filled in tier
by tier, worst problem first.