docs: add KyaniteLabs cross-link footer (SEO/internal linking)

[simongonzalezdc]

Why

Internal linking strengthens SEO/GEO authority flow between KyaniteLabs projects and surfaces related open-source tools to readers. Additive and low-maintenance.

What changed

• Added a consistent Part of KyaniteLabs footer to README.md linking to 3 related projects + kyanitelabs.tech.
• Docs only — no code, dependencies, or behavior change.

Verification

• Footer diff rendered; all links resolve to valid repos and the live site.
• License-accurate wording (neutral "More from KyaniteLabs", since some repos are BSL/source-available, not open-source).
• CI green.

Maintainer checklist

• Docs-only change
• No code/behavior change
• Links + license wording verified

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 596e791b-da9e-4d4a-9e90-8b7d67244422

📥 Commits

Reviewing files that changed from the base of the PR and between 3aefeea and a8bad11.

📒 Files selected for processing (1)

• README.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch seo/cross-links

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