Resolves
https://linear.app/arcadedev/issue/TOO-788/mypy-failures-are-silently-dropped-during-arcade-mcp-ci
<!-- CURSOR_SUMMARY -->
---
> [!NOTE]
> **Low Risk**
> Low risk: primarily CI/Makefile behavior and type-annotation tweaks;
functional logic is unchanged aside from stricter failure propagation in
`make check`.
>
> **Overview**
> **Stops CI from silently ignoring mypy failures.** The `make check`
target now runs `mypy` across `libs/arcade*/` and exits non-zero if any
package fails, reporting the failed libs.
>
> Separately tightens typing to satisfy `mypy` (removing `type: ignore`
on OAuth helpers, adding `cast()`/`Any` annotations for JSON response
shapes and subprocess kwargs, and handling non-`str` `server_address`
hosts), and bumps patch versions for `arcade-mcp` and
`arcade-mcp-server`.
>
> <sup>Reviewed by [Cursor Bugbot](https://cursor.com/bugbot) for commit
e79575b13a2d03adf3548104a0064c643f1e21b1. Bugbot is set up for automated
code reviews on this repo. Configure
[here](https://www.cursor.com/dashboard/bugbot).</sup>
<!-- /CURSOR_SUMMARY -->
cbe68462df