ci: add REUSE compliance lint job

[UnbreakableMJ]

Adds a dedicated REUSE Compliance job to ci.yml (using fsfe/reuse-action@v6) so the GPL/MIT SPDX headers + LICENSES/ setup introduced in #9 can't regress without CI catching it.

• Separate job (runs in parallel with the Rust build job; no Rust toolchain needed).
• .github/workflows/*.yml is already covered by REUSE.toml, so the edit stays compliant — verified locally: reuse lint → 54/54, REUSE 3.3 compliant.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 750aacc3-98a9-481e-ba22-ffc2566470b0

📥 Commits

Reviewing files that changed from the base of the PR and between 2f58900 and 5c8271a.

📒 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 ci-reuse-lint

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