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

docs/how-to/README.md

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+# Nyash How‑To Guides
+
+Task‑oriented, copy‑paste friendly instructions for common goals.
+
+Use when you already know what you want to do and just need the steps.
+
+Suggested structure (add as needed):
+- Build & Run
+  - AOT build with LLVM
+  - Run with PyVM / VM / JIT
+- Tooling
+  - Enable verbose logs
+  - Run curated smokes / parity checks
+- Language
+  - Using and namespaces quick setup
+  - Array/Map literals gate toggles
+
+Contributions: keep each guide short (1–2 screens), start with prerequisites, end with verify step.
+