Record the paired ruling at d34cc42, move jsonKind's comment onto Kind, name the manifest in Layout, and note the normalised manifest in item 185

README.md

@@ -1022,12 +1022,12 @@ valueproof.go   the value proof: what a typed column, calc operand or struct fie
 data.go         the load path: the categories internal/datafiles hands over, compiled into one merged tree, and the load pipeline every entry point runs
 cmd/fejkdata/   the fejkdata CLI
 internal/builtinfunc/ the {name()} functions: their checks and draws, checksums, date and time layouts, transforms and calc arithmetic
-internal/datafiles/ the walk of a data tree: its folders, its category files and the rows files beside them
+internal/datafiles/ the walk of a data tree: its folders, its category files and the rows files beside them, and its manifest
 internal/datatype/ the datatype a record column holds; the root's DataType is an alias of it
 internal/drawstate/ the seeded randomness and the {seq()} counters a generator draws through
 internal/grammar/ how the template language is written: format tokens, paths and selectors, reference sigils, identifiers, calc syntax, and whether a string is a template or a path
 internal/invariant/ the one phrase every package panics with when an invariant breaks
-internal/jsonvalue/ a decoded JSON value, its numbers kept as written, the one input a template compiles from
+internal/jsonvalue/ a decoded JSON value, its numbers kept as written, the one input a template compiles from, and the kind an error names it by
 internal/proven/ what a proof knows of a value, and the bounds a calc takes from its operands
 internal/rows/  a table's rows: the TSV, the options proved over it, the links between tables, row selection and draws, and the pin set one path or one named pick fixes
 data/           shipped data (JSON, and a TSV per table), embedded at build: locale folders, geo, misc