Start every render from the zero hold set

AGENTS.md

@@ -55,7 +55,7 @@ In [docs/decisions.md](docs/decisions.md):
 - A render shares one reference draw per category, per group
 - A draw group name is local to its category
 - The expansion hold and the render's draws are two fences
-- A record makes its draw maps up front, a `Fake` on its first read
+- A hold set makes its draw maps on the first read
 - A category never references itself, and a record's fences run at load
 - A record's column set is fixed before the first draw
 - Null is a `null` item, not a rate

docs/decisions.md

@@ -242,14 +242,15 @@ groups. They pin different things — an operand pins the value its own render p
 and stops at a reference, a path pins every level it passes through — so one walk would
 carry both rules and both scopes anyway, and tell them apart at every step.
 
-## A record makes its draw maps up front, a `Fake` on its first read
+## A hold set makes its draw maps on the first read
 
-A record's columns always read through the render's draws, so making the maps where the
+Every render starts from the zero `holdSet`, per goal 2's one spelling. Making the maps
-set is declared keeps them on that frame's stack. A `Fake` often reads no reference path
+where the set is declared kept a record's on its frame's stack, but a `Fake`'s set lives
-at all, and making them anyway cost about a fifth of the cheapest render, so it makes
+on the `Generator`, so there it cost every render two heap allocations and about half the
-them on the first read instead, at two heap allocations for a render that does share a
+cheapest one's time, measured 2026-09-28. Lazily, a render reading a reference path pays
-draw. The allocation gate over a repeat of a reference path and over a named draw group
+those two allocations, a record or struct included, and one reading none pays nothing;
-prices that, and pins what keeps a hold set off the heap.
+goal 11 holds either way. The allocation gate over a repeat of a reference path and over
+a named draw group prices that, and pins what keeps a hold set off the heap.
 
 ## A category never references itself, and a record's fences run at load
 

holdset.go

@@ -20,10 +20,6 @@ type renderScope struct {
 	pins  *pinSet
 }
 
-func eagerHoldSet() holdSet {
-	return holdSet{unnamed: hold{variant: map[string]node{}, value: map[string]readValue{}}}
-}
-
 // renderOnce renders n as one render, over a hold set of its own.
 func renderOnce(s *session, n node) string {
 	var set holdSet

record.go

@@ -130,7 +130,7 @@ func (f *Generator) FakeRecord(path string) (*Record, error) {
 	if err != nil {
 		return nil, fmt.Errorf("fejkdata: %s: %w", path, err)
 	}
-	set := eagerHoldSet()
+	var set holdSet
 	sc := renderScope{set: &set}
 	if t, isTable := n.(*table); isTable {
 		if n, err = tableRecord(f.rand, t, tail, sc); err != nil {
@@ -204,7 +204,7 @@ type RecordTemplate struct {
 func (t *RecordTemplate) Fake() *Record {
 	t.g.mu.Lock()
 	defer t.g.mu.Unlock()
-	set := eagerHoldSet()
+	var set holdSet
 	return renderRecord(t.g.rand, t.template, t.columns, renderScope{set: &set})
 }
 

struct.go

@@ -351,7 +351,7 @@ func (p *valueProof) checkField(label string, ft reflect.Type, column node) erro
 // fill draws the record into v's tagged fields, then each nested struct as a record of its own.
 func (s *structShape) fill(sess *session, v reflect.Value) {
 	if s.record != nil {
-		set := eagerHoldSet()
+		var set holdSet
 		for i, c := range renderRecord(sess, s.record, s.columns, renderScope{set: &set}).columns {
 			setColumn(fieldAt(v, s.fieldIndexes[i]), c)
 		}

todo.md

@@ -21,8 +21,6 @@ Self-sufficiency 5.6), every seat capped by Locality, and all nine naming
 
 This round, in order:
 
-- Start every render from one spelling of an empty hold set: `Fake` uses
-  `holdSet{}`, the record and struct paths `eagerHoldSet()`.
 - Correct the false comments: `funcCall` names `checkFunc` where `parseFormat`
   reports, `struct.go`'s "t sits at index within c.t" names no field, `recordFormats`
   calls ndjson "the same column", `Generator` says every other entry point takes `mu`