Docs IA reorg + mdBook setup + changelog migration#4

Merged

robertguss merged 3 commits intomainfrom

codex/docs-mdbook-changelog-reorg

Feb 9, 2026

Commits on Feb 9, 2026

RED: scaffold mdBook docs commands and summary index
robertguss
committed
GREEN: reorganize docs into sections and update navigation links
robertguss
committed
REFACTOR: migrate legacy docs history to changelog and retire source files
robertguss
committed