docs(patterns): add 'Patterns We Like' scrapbook + link from README

A running list of UI effects/interactions worth keeping, each with the four-point
bar (does a job, respects reduced-motion, transform/opacity only, degrades) it
must clear before shipping. README structure + quick-start now point to it.

README.md

@@ -26,7 +26,7 @@ KDCDesignSystem/
 ├── components/                # Per-component specs and anatomy
 ├── themes/                    # Light, dark, high-contrast theme overrides
 ├── templates/                 # Web, mobile, email, print, presentation
-├── docs/                      # Getting started, principles, a11y, voice & tone
+├── docs/                      # Getting started, principles, patterns, a11y, voice & tone
 ├── examples/                  # Reference implementations
 └── scripts/                   # Token build / export scripts
 ```
@@ -36,6 +36,7 @@ KDCDesignSystem/
 1. Read [`docs/getting-started/README.md`](./docs/getting-started/README.md).
 2. Skim [`design.md`](./design.md) for the token vocabulary.
 3. Pick your platform under [`examples/`](./examples/).
+4. Browse [`docs/patterns/README.md`](./docs/patterns/README.md) — a scrapbook of UI effects & interactions we like (and the bar each clears before shipping).
 
 ## Status