Give render and the draw fences one pin set

README.md

@@ -1338,11 +1338,12 @@ record.go       records: Record, the JSON/CSV/SQL serializers, and their entry p
 struct.go       structs: FakeStruct, fake tags, and a field's Go type as its column's datatype
 inline.go       inline templates: Template, NewTemplate, FakeTemplate, IsTemplate, and their compile and link
 template.go     the {token} grammar: scanning, tokens, operands, validation, compiling a format
-hold.go         the hold: one draw per expansion for paths and operands, and the rows it pins
+hold.go         the hold: one draw per expansion for paths and operands
 holdfence.go    the load fences over the hold: the routes and spellings that read one held name two ways
 holdset.go      one reference draw per render and group: the hold set a render reads its paths through
 drawfence.go    the load fences over reference draws: a drawGroup's, a render's and a record's columns, and the walk over what a render reads
-family.go       a family of linked tables: what a reference path reads of one, the rows a walk enters, and the fences over paths into it
+family.go       a family of linked tables: what a reference path reads of one, and the fences over paths into it
+pins.go         the pin set: the table rows a render fixes, which the draw fences replay
 reference.go    reference sigils, and binding references across the tree
 graph.go        the node graph: tree walks, containment and render edges, and the cycle and repeat fences
 builtins.go     the {name()} function registry and its implementations