zio Add a Missing Section
The section-type templates are provided verbatim in the add-section agent's instructions (single
source of truth: references/section-patterns.md). It carries the
subsection layout, table shape, and code-block modifier for each of the five section types, plus the
cross-pattern rules shared by all of them (code-block modifiers, the sentence-before-a-fence rule,
plain-scala signatures).
Nothing mounts this skill today: src/add-section.ts imports the reference directly, because a
single-purpose agent needs the patterns on turn 1 of every run and progressive disclosure would only
add a turn and a way to skip it. The directory is a skill so that a consumer which needs it
sometimes — the drafter, writing a fresh page whose sections match one of these five shapes — can
mount it without moving content.