docs: add MIR13 mode doc and set PHI-off as default; bridge lowering split (if/loop/try); llvmlite resolver stabilization; curated runner default PHI-off; refresh CURRENT_TASK.md

src/llvm_py/llvm_builder.py

@@ -1,7 +1,7 @@
 #!/usr/bin/env python3
 """
 Nyash LLVM Python Backend - Main Builder
-Following the design principles in docs/LLVM_LAYER_OVERVIEW.md
+Following the design principles in docs/design/LLVM_LAYER_OVERVIEW.md
 """
 
 import json