feat: standardise CI steps for PRs

[ssherar]

No description provided.

[Copilot]

Pull Request Overview

This PR standardizes CI steps for pull requests by restructuring the GitHub Actions workflow and adding supporting Makefile targets. The changes implement a more comprehensive CI pipeline with separate jobs for setup, testing, and formatting checks.

• Split CI into separate jobs for better parallelization and clarity
• Added colored output support and standardized test target in Makefile
• Enhanced workflow to run on both pushes and pull requests with proper job dependencies

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
Makefile	Adds color output variables, shell configuration, and a standardized test target
.github/workflows/main.yml	Restructures CI workflow into separate jobs with proper dependencies and formatting checks

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