Convert the "Where to go next" items in the architecture overview from
plain text to proper Markdown links. This was the only finding from the
Task 18 verification pass; everything else (links, commands, TOML
coverage, subsystem coverage, terminology) is self-consistent across
the 17 new doc files.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>