Picks up pipeline PR #59: summary_categories now carries 66 M/L rows under
spend_subtype = intergovernmental (194 -> 260 rows).
cog_categories() (R/categories.R) has no item-code prefix filter, so the new
IG rows surface immediately as a third spend subtype; this broke
test-categories.R:18's closed enumeration. Adjudicated (2026-07-27): this is
correct behavior, not a regression -- cog_categories() is a discovery verb
documented to surface valid category values, and after Task 3 lands users
will see spend_subtype = intergovernmental in cog_spending(expenditure_concept
= total) results. Widened the subtype assertion and added positive coverage
asserting the intergovernmental subtype and that it reuses existing functional
categories (plus Other Education, pipeline #58). R/categories.R itself is
unchanged -- its behavior was already right.
Suite: PASS 469, FAIL 0 (baseline 467 + widened assertion + 2 new
expectations).
Discovery verb over the summary_categories view, grouped one row per
(category, subtype). Parallels cog_gov_search: analysts use it to
find the valid `category` values to pass into cog_spending(),
cog_revenue(), cog_geographic_rollup().
Columns: category, category_type, subtype, n_codes, item_codes
(comma-separated, alphabetical). Optional filters:
type = NULL | "spending" | "revenue"
pattern = regex matched case-insensitively on category
The user-facing "spending" alias is translated internally to the
corpus-native "expenditure" so callers don't have to learn Census
vocabulary, while the returned category_type column preserves the
native value for auditability.
Also: fix @noRd placement in session.R so devtools::document() stops
warning.
Tests: +16 new / 181 total pass. check 0E/0W/0N.
jared