ci: checkout before paths-filter so push-to-main runs pass

[psimaker]

Problem

The CI run for the merge of #34 to main failed in the Detect changes job:

[command]/usr/bin/git branch --show-current
fatal: not a git repository (or any of the parent directories): .git
The process '/usr/bin/git' failed with exit code 128

Cause

The changes job ran dorny/paths-filter@v3 without a checkout. That is fine on pull_request events, where paths-filter lists changed files via the GitHub API. But on push events (the merge to main) there is no PR to query, so it falls back to a local git diff and needs a working copy. With no .git present, its first git command fails with exit code 128.

This surfaced only after merge: #34 introduced the changes job itself, and push-to-main was the first push event to exercise it. The PR checks passed because they ran on pull_request.

Fix

Add actions/checkout@v6 as the first step of the changes job so it works on both push and pull_request. Also updated the now-misleading comment.

Impact

• Required checks (Go Tests, Notify Tests, Design Token Lint) were already green, so branch protection was never blocked.
• The macOS Build & Test job was wrongly skipped on the failing run; with the checkout in place it is gated correctly again.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro Plus

Run ID: e7c04f50-007c-42b5-9008-e8d4a7fb135f

📥 Commits

Reviewing files that changed from the base of the PR and between 0857e6d and 2c4051d.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/ci-detect-changes-checkout

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