docs(plugin-form): the currency-scale report's prose says both validators judge a declared subform column now (objectui#11266)

reportCurrencyColumnScale's docblock and the currencyScale-10783 test header
and one test name said a subform's columns is z.array(z.any()) in the
object-form mirror and in the spec's FormViewSchema, and that the spec does
not judge that path. This PR makes the mirror half false, and
@objectstack/spec 17.6.0 already made the spec half false: both now judge a
declared column with InlineGridColumnSchema.

The reason the render-time report exists is restated truthfully: neither zod
face sees an identity-only { name, scale } column whose child field is a
currency, only defineStack does at publish (objectstack#20927), and nothing
runs either validator between a stored or code-built form view and the
render. Comment and test-name bytes only; the TS printer with removeComments
shows no other change.

Claude-Session: https://claude.ai/code/session_01CPvhwGcirXqBGEdPSb72TZ
Co-authored-by: Claude <noreply@anthropic.com>

Author: claude

packages/plugin-form/src/deriveMasterDetail.currencyScale-10783.test.ts

@@ -14,9 +14,12 @@
  * `@objectstack/spec` 17.5.0 refuses `scale` on an inline grid column that
  * declares `type: 'currency'`. A column that declares no `type`
  * (`{ name: 'amount', scale: 2 }`) still parses: `hydrateColumns` fills its
- * `type` from the child field at render time, which the spec cannot see, and
- * `objectui validate` cannot either (a subform's `columns` is
- * `z.array(z.any())`, and the child object's fields are not in the document).
+ * `type` from the child field at render time. The spec's column schema cannot
+ * see that, and `objectui validate` cannot either: it judges a subform's
+ * `columns` with that same schema (objectui#11266), and the child object's
+ * fields are not in the document. Only `defineStack` refuses it, at publish, by
+ * resolving `name` against the child object the stack declares
+ * (objectstack-ai/objectstack#20927); nothing in objectui does.
  * `GridField`'s `currencyWidth` no longer reads a currency column's `scale`, so
  * without a report here the key would be accepted everywhere and read by
  * nothing.
@@ -69,7 +72,7 @@ describe('hydrateColumns reports a `scale` on a column that hydrates to currency
     expect(computeRow(cols, { quantity: 3, unit_price: 1.2345 }, 'KWD').amount).toBe(3.704);
   });
 
-  it('a declared currency column carrying `scale` is reported too (the form-view `subforms[].columns` path the spec does not judge)', () => {
+  it('a declared currency column carrying `scale` is reported too (a stored or code-built form view reaches the render without passing either validator)', () => {
     const warnings = spyWarn();
     hydrateColumns([{ name: 'amount', type: 'currency', computed: true, expr: 'quantity * unit_price', scale: 2 }], lineSchema('line_declared'));
     const reports = warnings().filter((m) => m.includes('`scale`'));

packages/plugin-form/src/deriveMasterDetail.ts

@@ -296,14 +296,22 @@ export function deriveColumns(
  * docblock says the reach stops there: an identity-only entry
  * (`{ name: 'amount', scale: 2 }`) takes its type from the child field at
  * render time, here, so it still parses. `objectui validate` cannot see it
- * either: a subform's `columns` is `z.array(z.any())` in the `object-form`
- * mirror, and the child object's fields are not in the document it judges.
- * This is the first place the child field is known, so the report is made
- * here — ⛔ never a silent drop.
+ * either: the `object-form` mirror judges a subform's `columns` with the spec's
+ * own `InlineGridColumnSchema` (objectui#11266), and the child object's fields
+ * are not in the document it judges. Only `defineStack` refuses it, at publish, by resolving
+ * `name` against the child object's fields: on a relationship field's
+ * `inlineColumns` and on a form view's `subforms[].columns`, and only when the
+ * stack declares that child object (objectstack-ai/objectstack#20927). Nothing
+ * in objectui does that, and this is the first place in objectui the child
+ * field is known, so the report is made here — ⛔ never a silent drop.
  *
- * The declared arm is reported too. A form view's `subforms[].columns` is
- * `z.array(z.any())` in the spec's `FormViewSchema`, so a typed currency column
- * carrying `scale` reaches this function unjudged on that path.
+ * The declared arm is reported too. On a form view's `subforms[].columns` both
+ * validators refuse a typed currency column carrying `scale`: the spec's
+ * `FormViewSchema` holds each column to `InlineGridColumnSchema` from 17.6.0,
+ * and the `object-form` mirror takes that schema by reference (objectui#11266).
+ * Neither runs between a stored or code-built form view and this function, so
+ * such a column can still arrive here, and it is reported rather than read in
+ * silence.
  *
  * Once per column per page load (the `sectionFields.ts` convention): this runs
  * on every child-schema resolve. The first sentence is the spec's refusal with