[Hugo-JC]

Summary

Adds an isolated research note with the first two page-level inspections for the Visual Intelligence work:

• Linear's official design-refresh article: hierarchy, navigation restraint, icon use, structural separation and reversible visual experimentation.
• GitHub Primer's official layout guidance: viewport ranges, page anatomy, split layouts and responsive list-detail adaptations.

Evidence integrity

• Both records are classified as official-documentation, not direct live-product observations.
• Both remain partial with medium confidence.
• The note separates source statements, transferable principles, adaptation guidance and limitations.
• No source is promoted in the canonical catalogs yet.

Merge safety

This PR adds one new Markdown file only:
docs/research/visual-intelligence/2026-11-11-initial-reference-inspections.md

It does not modify existing schemas, catalogs, manifest counts, runtime code, tests, commands or skills. This keeps the research contribution isolated from the planned Copilot implementation.

Validation

Documentation-only change. Canonical catalog promotion and npm run validate:visual-library are intentionally deferred until maintainer review.