The roll API validates its `area` parameter against the surface's list, which
meant importing the taxonomy into a Pages Function. composition-catalog.mjs
reads the filesystem, so importing from there would have pulled node:fs into
the Worker bundle, the same trap WELL_TIERS hit. roll-selection.mjs has no
imports at all and is what both callers already load, so it owns the taxonomy
and composition-catalog re-exports it.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>