docs(grid): point the boolean-token retirement note at objectstack#4173 (#3045)

framework#3786 is the closed pattern-sweep umbrella; the concrete tracking
item for exporting BOOL_TRUE/BOOL_FALSE from the spec — the one condition
that lets these local sets and their pinned inventory be deleted — is
objectstack#4173. Comment-only.

Co-authored-by: Jack Zhuang <277994282+os-zhuang@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: os-zhuang

packages/plugin-grid/src/importCoercionContract.test.ts

@@ -12,7 +12,7 @@
  *
  * `REFERENCE_IMPORT_TYPES` is derived from the same spec constant the server
  * derives from, so the two ends share one source. The boolean token table has
- * no spec export yet (framework#3786), so it cannot be derived — the pinned
+ * no spec export yet (objectstack#4173), so it cannot be derived — the pinned
  * inventory below is the tripwire that makes edits deliberate instead of
  * silent. When the spec starts publishing the table, replace the local sets
  * with the import and delete the inventory.

packages/plugin-grid/src/importCoercionContract.ts

@@ -23,7 +23,7 @@ import { REFERENCE_VALUE_TYPES } from '@objectstack/spec/data';
  *
  * The spec does not publish this table yet, so it cannot be derived — the
  * paired inventory in the test is the tripwire that keeps edits deliberate
- * (framework#3786 tracks exporting it from the source of truth).
+ * (objectstack#4173 tracks exporting it from the source of truth).
  */
 export const BOOLEAN_TRUE_IMPORT_TOKENS: ReadonlySet<string> = new Set([
   'true', 't', 'yes', 'y', '1', 'on', '是', '对', '✓', '√',