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/coding-agent/examples/extensions/dynamic-resources/dynamic.json

@@ -1,5 +1,5 @@
 {
-	"$schema": "https://raw.githubusercontent.com/earendil-works/pi/main/packages/coding-agent/src/modes/interactive/theme/theme-schema.json",
+	"$schema": "https://pi.dev/schemas/theme.schema.json",
 	"name": "dynamic-resources",
 	"vars": {
 		"cyan": "#00d7ff",