docs: clarify karesansui philosophy vs Western minimalism (#113)

Add explicit explanation that karesansui is NOT efficiency-driven minimalism:
- Add definition of karesansui (Japanese rock garden) in opening note
- Add "What This Is Not" section contrasting the two philosophies
- Western minimalism asks "What can we remove?"
- Karesansui asks "What deserves to remain?"
- Explicitly reject "If it works, it's fine" mentality
- Emphasize that sand patterns and accents ARE the richness, not waste
- Closing insight: "intentional richness that appears minimal"
This prevents misreading the philosophy as mere simplification for efficiency.

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Model-Raw: claude-opus-4-5-20251101

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

Author: nullvariant

extensions/git-id-switcher/docs/DESIGN_PHILOSOPHY.md

@@ -2,6 +2,9 @@
 
 *A design philosophy for Git ID Switcher*
 
+> **Note**: Karesansui (枯山水) is a Japanese rock garden--sand and stone representing mountains and water.
+> This philosophy is not efficiency-driven minimalism. It invests deeply in what appears simple.
+
 ---
 
 ## Placing Stones
@@ -89,6 +92,32 @@ Lining up coverage badges is like hanging a scroll. They're there because they'r
 
 ---
 
+## What This Is Not
+
+Karesansui is not Western minimalism.
+
+Western minimalism asks: "What can we remove?"
+Karesansui asks: "What deserves to remain?"
+
+Western minimalism removes to save cost and effort.
+Karesansui invests enormously to *appear* simple.
+
+In a real karesansui, sand patterns require daily raking.
+In this codebase, "invisible quality" requires continuous investment.
+The "empty" space is the most intentional part.
+What looks effortless demands the most effort.
+
+"Eliminate waste" misses the point entirely.
+"If it works, it's fine" has no place here.
+In this garden, sand patterns and accents *are* the richness--not waste to be cut.
+
+The goal is not efficiency or quick results.
+The goal is depth disguised as simplicity.
+
+Karesansui is intentional richness that *appears* minimal.
+
+---
+
 ## Origin
 
 2003\. CSS Zen Garden.