Cursor versioning rules (#715)

Rules to update versions of libraries that were changed and any
dependencies if there are breaking changes

<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Adds `.cursor/rules/versioning.mdc` with semver rules and dependency
graph for the arcade libraries.
> 
> - **Docs**:
>   - Add `.cursor/rules/versioning.mdc`:
> - Defines semver rules and when to bump library and dependency
versions.
> - Documents dependency graph for `arcade-core`, `arcade-tdk`,
`arcade-serve`, `arcade-mcp-server`, and `arcade-mcp`.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
6974d4ffc6f238bd0a56d0f88fc8005560e00018. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

---------

Co-authored-by: Eric Gustin <34000337+EricGustin@users.noreply.github.com>

.cursor/rules/versioning.mdc

@@ -0,0 +1,25 @@
+---
+description: Guidelines for library versioning
+alwaysApply: true
+---
+
+# Versioning
+This repository contains 5 libraries: arcade-core, arcade-tdk, arcade-serve, arcade-mcp-server, and arcade-mcp (CLI)
+
+## Dependency graph recap:
+1. arcade-core
+    - The base library
+2. arcade-tdk
+    - Depends on: arcade-core
+3. arcade-serve
+    - Depends on: arcade-core
+4. arcade-mcp-server
+    - Depends on: arcade-core, arcade-serve, arcade-tdk
+5. arcade-mcp
+    - Depends on: arcade-mcp-server, arcade-core
+    - Dev/optional deps: arcade-serve, arcade-tdk
+
+## Rules
+- ALWAYS use semver (semantic versioning)
+- ALWAYS increase the version of a library in pyproject.toml when a library's code is modified.
+- ALWAYS increase the minimum required version of dependencies if there is a breaking change between dependencies