Bump core from afd3772 to 02cd6f4 (#250)

Bumps [core](https://github.com/microsoft/typespec) from `afd3772` to
`02cd6f4`.
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/microsoft/typespec/commit/02cd6f4d8f10be6bdfbed1b0505644603faa23f5"><code>02cd6f4</code></a>
Update encoding.md (<a
href="https://redirect.github.com/microsoft/typespec/issues/2903">#2903</a>)</li>
<li><a
href="https://github.com/microsoft/typespec/commit/639d8992c80db27113b5812b800a568c3bfef627"><code>639d899</code></a>
Add e2e test for the CLI (<a
href="https://redirect.github.com/microsoft/typespec/issues/2878">#2878</a>)</li>
<li>See full diff in <a
href="https://github.com/microsoft/typespec/compare/afd377242ea73eaace3460cd327ee74c52d5933f...02cd6f4d8f10be6bdfbed1b0505644603faa23f5">compare
view</a></li>
</ul>
</details>
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