Fix YAML indentation in GuaridOS entry

[Copilot]

GitHub Actions validation failed on PR #4515 with missing field 'name' at line 7978 column 13 due to incorrect indentation in the GuaridOS entry.

Changes

• Fixed GuaridOS entry indentation from 13 spaces to 12 spaces to match landscape.yml standard
• Added logo file hosted_logos/guaridOS.svg

Before:

- item:
   name: GuaridOS           # 13 spaces - parser doesn't recognize as item field
   description: ...

After:

- item:
  name: GuaridOS            # 12 spaces - correct
  description: ...

The entry is now correctly parsed at landscape[3].subcategories[3].items[28] with all required fields (name, description, homepage_url, repo_url, logo, twitter, crunchbase).

Original prompt

https://github.com/cncf/landscape/actions/runs/17712927401/job/50429508804?pr=4515 explain this problem and lint the file. If it's not a linting error form a plan.

---

✨ Let Copilot coding agent set things up for you — coding agent works faster and does higher quality work when set up for your repo.