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/durable/test/fixtures/delete-buffer.ts

@@ -0,0 +1,2 @@
+// Preloaded before the measured module graph so modules observe a browser-like global without Node's Buffer.
+Reflect.deleteProperty(globalThis, "Buffer");