chore(pi): require RivetKit 2.3.26

[eersnington]

Require RivetKit 2.3.26, which includes the sleep fixes in rivet-dev/rivet#5835 and rivet-dev/rivet#5836.

• packages/pi: rivetkit dev dependency 2.3.23 → 2.3.26, peer range >=2.3.26 <2.4.0.
• examples/docs: rivetkit and @rivetkit/react 2.3.23 → 2.3.26.

2.3.26 turns off WebSocket hibernation by default, so sleep now closes client connections. A Pi watch ends when the actor sleeps, and the client watches again when its connection opens:

	RivetKit 2.3.23	RivetKit 2.3.26
Connection at sleep	Hibernates, stays open	Closes, client reconnects
Pi watch after wake	Reattached on the same connection	Client calls watchEvents again

const conn = client.agent.getOrCreate(key).connect();
const root = await conn.harness.root();
// Runs now, and again each time the connection reopens after sleep.
conn.onOpen(() => void conn.conversation.watchEvents(root.id));

• tests/watch.test.ts: the test that expected a connection to survive sleep now covers the reconnect pattern above.
• tests/actor.test.ts: covers watch reattach when Pi Durable reopens after a failed commit. The removed sleep test was its only coverage.

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This is part 1 of 2 in a stack:

•  2  fix(pi): finish calls already using Pi before a sleep closes it #351
•  1  chore(pi): require RivetKit 2.3.26 #350 👈

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