📚 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_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
+  }
+}
+