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/extensions/dynamic-resources/index.ts

@@ -0,0 +1,15 @@
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
+
+const baseDir = dirname(fileURLToPath(import.meta.url));
+
+export default function (pi: ExtensionAPI) {
+	pi.on("resources_discover", () => {
+		return {
+			skillPaths: [join(baseDir, "SKILL.md")],
+			promptPaths: [join(baseDir, "dynamic.md")],
+			themePaths: [join(baseDir, "dynamic.json")],
+		};
+	});
+}