new context engineering section under prompt engineering with initial quickstart doc

Author: emanbareket

src/docs.json

@@ -628,6 +628,12 @@
                     }
                   ]
                 },
+                {
+                  "group": "Context engineering",
+                  "pages": [
+                    "langsmith/context-engineering-quickstart"
+                  ]
+                },
                 {
                   "group": "Tutorials",
                   "pages": [

src/langsmith/context-engineering-quickstart.mdx

@@ -0,0 +1,53 @@
+---
+title: Context engineering quickstart
+sidebarTitle: Quickstart
+---
+
+
+
+
+## 1. Open the Context Hub
+
+In the [LangSmith UI](https://smith.langchain.com), select **Context** in the
+left-hand navigation. The Context Hub lists every agent and skill in your workspace
+
+![The Context Hub home view listing existing Agent and Skill contexts with their commit metadata.](/langsmith/images/context-hub-home.png)
+
+## 2. Create context
+
+1. Click **+ Create** in the top left of the Context Hub.
+1. Choose the context type:
+    - **Agent** — a full agent bundle including an `AGENTS.md` file and tools.
+    - **Skill** — a reusable capability that agents can use including a `SKILL.md` file
+
+    <img src="/langsmith/images/context-hub-create-context.png" alt="The Create dropdown showing the Agent and Skill context type options." width="360" />
+
+1. Edit and create
+
+## 3. View context
+Click on an agent or skill from the Context Hub to view it
+
+![An Agent context with an AGENTS.md file open, showing the environments panel, commit history, and file tree.](/langsmith/images/context-hub-agent-view.png)
+
+The middle panel shows the files in the current commit and
+the right panel previews the selected file.
+
+Each saved change creates a new **commit** in the **Commit History** panel on
+the left, so you can browse, compare, and revert prior versions without losing
+work.
+
+## 4. Tag and promote a commit
+
+Once a commit is ready to ship, promote it to an environment so downstream
+agents can pull it.
+
+1. With the target commit selected, click **Promote** in the top right.
+1. Choose the destination environment:
+    - **Promote to Production** — the commit your production agents pull.
+    - **Promote to Staging** — a pre-production environment for validation.
+
+    <img src="/langsmith/images/context-hub-promote.png" alt="The Promote dropdown with options to promote a commit to Production or Staging." width="300" />
+
+1. The environment label (for example, `Production 7ca95573`) moves to the
+   promoted commit. Use the **Tag** button next to **Promote** to attach a
+   human-readable label to any commit for easy reference.