chore: finalize multirepo consolidation and governance synchronization

[garnizeh]

This PR completes the multirepo consolidation (M10146) for the void-rush repository by:

1. Updating the README to reflect the latest milestone.
2. Synchronizing governance infrastructure (CI workflows, branding guards, justfile).
3. Standardizing documentation validation scripts.

[coderabbitai]

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: 6640013c-ac9b-4e7a-8d7f-aa9fdc3c668f

📥 Commits

Reviewing files that changed from the base of the PR and between a033742 and 56b3dde.

📒 Files selected for processing (10)

• .codespellrc
• .github/copilot-instructions.md
• .github/workflows/ci.yml
• README.md
• docs/ECS_DESIGN.md
• docs/THEME_WORLD_DESIGN.md
• justfile
• scripts/check_branding.py
• scripts/check_links.py
• scripts/doc_lint.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/m10146-multirepo-consolidation

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