📚 Reorganize CLAUDE.md: slim down from 916 to 395 lines with proper doc links

- Keep essential information within 500 lines (now 395 lines)
- Maintain important syntax examples and development principles
- Move detailed information to appropriate docs files:
  - Development practices → docs/guides/development-practices.md
  - Testing guide → docs/guides/testing-guide.md
  - Claude issues → docs/tools/claude-issues.md
- Add proper links to all referenced documentation
- Balance between minimal entry point and practical usability

examples/llvm11_array_smoke.nyash

@@ -0,0 +1,15 @@
+// LLVM 11.2 minimal smoke: ArrayBox new/set/get and console.log
+
+static box Main {
+  main() {
+    console.log("LLVM 11.2 smoke start")
+
+    local arr, x
+    arr = new ArrayBox()
+    arr.set(0, 42)
+    x = arr.get(0)
+
+    console.log("OK")
+    return 0
+  }
+}

examples/llvm11_console_smoke.nyash

@@ -0,0 +1,9 @@
+// LLVM 11.2 minimal smoke: console.log with string literal only
+
+static box Main {
+  main() {
+    console.log("LLVM 11.2 smoke")
+    return 0
+  }
+}
+

examples/llvm11_core_smoke.nyash

@@ -0,0 +1,14 @@
+// LLVM 11.2 minimal smoke: core ops only (Const/BinOp/Compare/Branch/Return)
+
+static box Main {
+  main() {
+    local x, y
+    x = 1
+    y = 2
+    if (x < y) {
+      x = x + y
+    }
+    return x
+  }
+}
+