chore(vendor): import pi 1.3.0

Imported as a linear vendor commit so forge rebases do not replay the upstream root tree.

git-subtree-dir: third_party/pi

git-subtree-split: 71023aec1546d6d677a65669c5665c0927ce0dd0

third_party/pi/packages/chord/src/delta/draft.ts

@@ -0,0 +1,10 @@
+/** A mutable transaction-scoped view of a JSON value, preserving tuple positions. */
+export type Draft<T, Depth extends readonly unknown[] = []> = Depth["length"] extends 8
+	? T
+	: T extends null | boolean | number | string
+		? T
+		: T extends (...args: never[]) => unknown
+			? T
+			: T extends object
+				? { -readonly [Key in keyof T]: Draft<T[Key], [...Depth, unknown]> }
+				: T;