remove references to the ai chat reference project from the docs

Author: ericallam

docs/ai-chat/patterns/code-sandbox.mdx

@@ -12,9 +12,6 @@ This page describes a **durable chat** pattern that fits `chat.agent()`:
 - **Reuse** it for every `executeCode` tool call during that turn (and across turns in the same run if you keep the handle).
 - **Dispose** it **right before the run suspends** waiting for the next user message — using the **`onChatSuspend`** hook, not `onTurnComplete`.
 
-<Info>
-  The reference implementation lives in the monorepo at [`references/ai-chat`](https://github.com/triggerdotdev/trigger.dev/tree/main/references/ai-chat) (`code-sandbox.ts`, `chat-tools.ts`, `trigger/chat.ts`).
-</Info>
 
 ## Why not tear down in `onTurnComplete`?
 

docs/ai-chat/patterns/database-persistence.mdx

@@ -9,7 +9,7 @@ Durable chat runs can span **hours** and **many turns**. You usually want:
 1. **Conversation state** — full **`UIMessage[]`** (or equivalent) keyed by **`chatId`**, so reloads and history views work.
 2. **Live session state** — the **current Trigger `runId`**, a **scoped access token** for realtime + input streams, and optionally **`lastEventId`** for stream resume.
 
-This page describes a **hook mapping** that works with any database. The [ai-chat reference app](https://github.com/triggerdotdev/trigger.dev/tree/main/references/ai-chat) implements the same idea with a SQL database and an ORM; adapt table and column names to your stack.
+This page describes a **hook mapping** that works with any database. Adapt table and column names to your stack.
 
 ## Conceptual data model
 

docs/ai-chat/sub-agents.mdx

@@ -245,4 +245,4 @@ export const myAgent = chat.agent({
 });
 ```
 
-For `chat.customAgent()`, define the tool and sub-agent Map inside the `run` closure so they survive across turns. See [Example 7 in the ai-chat reference project](https://github.com/triggerdotdev/trigger.dev/blob/main/references/ai-chat/src/trigger/chat-client-test.ts) for a complete working example.
+For `chat.customAgent()`, define the tool and sub-agent Map inside the `run` closure so they survive across turns.