chore(vendor): import pi 0.85.1

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: d981de1229ef899957bbe968bc8dcda02a21f477

third_party/pi/packages/coding-agent/examples/plugins/pi-example-plugin/package.json

@@ -0,0 +1,10 @@
+{
+	"name": "@earendil-works/pi-example-plugin",
+	"version": "1.0.0",
+	"private": true,
+	"type": "module",
+	"peerDependencies": {
+		"@earendil-works/chord": "^0.84.4",
+		"@earendil-works/pi-coding-agent": "^0.84.4"
+	}
+}