ROADMAP.md was named as a destination in two places but never created,
indexed, or read back. Add the convention to how-i-work.md, note it after
the README decision tree and in the loads-when table, give it a row in the
portability layer table, make the retrofit prompt create it, and have
handoff seed it and pull from it when Current state's next steps run thin.
Top-level index and in-the-moment lookup: the four core documents, the
decision tree for where each instruction goes, what loads when, and the
session rhythm.
Keysat