Add CI/CD test for formatting and make errors on warnings for existing build test

[miles-p]

1. Formatting test like on NUbots/NUbots
2. Errors on warnings on our existing CI pipeline (I was the biggest culprit of getting crappy warning-ridden code to main)
3. Makes the codebase pass the CI/CD checks by formatting the entire thing to our .clang-format

:)

[Copilot]

Pull request overview

This PR tightens CI enforcement for the NUSense firmware by adding an automated clang-format check and making the existing firmware build fail on compiler warnings (via a dedicated PlatformIO CI environment). It also reformats touched NUSense source files to comply with the repository’s .clang-format.

Changes:

• Add a GitHub Actions workflow to check clang-format compliance in the NUSense codebase.
• Add a stricter PlatformIO environment (nucleo_h753zi_ci) that enables -Werror, and update the CI build to use it.
• Apply formatting-only changes across several NUSense source/header files.

Reviewed changes

Copilot reviewed 7 out of 8 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
NUSense/platformio.ini	Adds a CI PlatformIO env extending the existing one and enabling -Werror.
NUSense/Core/Src/uart/RS485.h	Formatting-only adjustments (includes order, spacing, comments).
NUSense/Core/Src/uart/Port.cpp	Formatting-only adjustment to a wrapped expression.
NUSense/Core/Src/nusense/Convert.cpp	Formatting-only line wrapping for long expressions.
NUSense/Core/Src/fan_controller.c	Formatting-only whitespace/brace/indentation cleanup.
NUSense/Core/Src/device/Pulser.hpp	Formatting-only whitespace alignment tweaks.
.github/workflows/format.yml	Adds clang-format CI workflow.
.github/workflows/build.yml	Switches CI build to the stricter PlatformIO env.

Suppressed comments (1)

.github/workflows/format.yml:11

• runs-on: ubuntu-latest can change underneath you, but this workflow relies on a specific clang-format-18 package/binary. Pinning the runner image makes the formatting check more stable over time.

  clang-format:
    runs-on: ubuntu-latest

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.