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/examples/00-conversation.ts

@@ -0,0 +1,21 @@
+// A Session stores conversations, transcript entries, tasks, and documents.
+// Run from packages/durable:
+//   node --conditions=source --experimental-strip-types test/examples/00-conversation.ts
+import { BACKGROUND_CONTEXT } from "@earendil-works/chord/context";
+import { createSession, MemoryStorage } from "../../src/index.ts";
+
+// MemoryStorage keeps everything in memory; other storage backends keep it on disk.
+const session = createSession(new MemoryStorage());
+
+// Every Session call takes a context, which is used for cancellation.
+// BACKGROUND_CONTEXT means "never cancel".
+const context = BACKGROUND_CONTEXT;
+
+// All writes happen inside session.commit(). The callback receives a
+// transaction `tx`; everything it writes is saved together when the callback
+// returns, or discarded if it throws.
+// "ownerless" means no task created this conversation.
+const standalone = await session.commit((tx) => tx.createConversation({ ownership: { kind: "ownerless" } }), context);
+console.log("standalone conversation:", standalone);
+
+await session.close(context);