Review and mark one source as source-checked

[TommiLindfors]

What needs doing

We have source records in data/sources/lu/ with verification_status: discovered. We need someone to actually read the source page and confirm the data matches.

Steps

1. Pick a source file from data/sources/lu/
2. Open the URL in the file and read the page
3. Check: does the title match? Is the language correct? Is the jurisdiction right?
4. If everything checks out, change verification_status from discovered to source-checked
5. Update accessed_at to today's date
6. Open a PR describing what you verified

Why this matters

This is exactly how Clarvia builds trust — real humans verifying that our data matches official sources.

Time estimate

~15 minutes

Skills needed

Attention to detail. French reading helpful for Luxembourg sources.

[TommiLindfors]

Closing as completed. Hiren verified and marked both Luxembourg Guichet sources as source-checked in PR #39.