Improved create-twenty-app documentation for AI coding agents (#20325)

Added a bit of enhanced context for better agentic coding, based on this
[Discord
conversation](https://discord.com/channels/1130383047699738754/1130383048173682821/1501538550301331477).

---------

Co-authored-by: Félix Malfait <felix@twenty.com>
Co-authored-by: Félix Malfait <felix.malfait@gmail.com>

packages/twenty-docs/developers/extend/apps/operations/overview.mdx

@@ -0,0 +1,29 @@
+---
+title: Overview
+description: Build, test, and ship your app — CLI commands, integration tests, CI, and publishing to a server or to npm.
+icon: "rocket"
+---
+
+The **operations layer** is everything you do *to* your app rather than *with* it: invoking CLI commands, running integration tests against a real Twenty server, configuring CI, and shipping releases — either as a tarball deployed to a single server or as an npm package listed in the marketplace.
+
+```text
+   develop ─▶ test ─▶ build ─▶ deploy / publish
+   ───────    ────    ─────    ─────────────────
+   yarn       yarn    yarn     yarn twenty deploy   (tarball → one server)
+   twenty     test    twenty
+   dev                build    yarn twenty publish  (npm → marketplace)
+```
+
+## In this section
+
+<CardGroup cols={2}>
+  <Card title="CLI" icon="terminal" href="/developers/extend/apps/operations/cli">
+    `yarn twenty` reference — exec, logs, uninstall, remotes.
+  </Card>
+  <Card title="Testing" icon="flask" href="/developers/extend/apps/operations/testing">
+    Vitest setup, integration tests, type checking, CI workflow.
+  </Card>
+  <Card title="Publishing" icon="upload" href="/developers/extend/apps/operations/publishing">
+    Build, deploy a tarball, publish to npm, install.
+  </Card>
+</CardGroup>