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/development/issues/arraybox_invalid_args.md

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+# ArrayBox get/set -> Invalid arguments (plugin side)
+
+Status: open
+
+Summary
+
+- Error messages observed during AOT/LLVM smoke that touches ArrayBox:
+  - "Plugin invoke error: ArrayBox.set -> Invalid arguments"
+  - "Plugin invoke error: ArrayBox.get -> Invalid arguments"
+- VInvoke(MapBox) path is stable; issue is isolated to ArrayBox plugin invocation.
+
+Environment
+
+- LLVM 18 / inkwell 0.5.0 (llvm18-0)
+- nyash-rust with Phase 11.2 lowering
+- tools/llvm_smoke.sh (Array smoke is gated via NYASH_LLVM_ARRAY_SMOKE=1)
+
+Repro
+
+1) Enable array smoke explicitly:
+   - `NYASH_LLVM_ARRAY_SMOKE=1 ./tools/llvm_smoke.sh release`
+2) Observe plugin-side errors for ArrayBox.get/set.
+
+Expected
+
+- Array get/set should be routed to NyRT safety shims (`nyash_array_get_h/set_h`) with handle + index/value semantics that match the core VM.
+
+Observed
+
+- Plugin path is taken for ArrayBox.get/set and the plugin rejects arguments as invalid.
+
+Notes / Hypothesis
+
+- LLVM lowering is intended to map ArrayBox.get/set to NyRT shims. The plugin path should not be engaged for array core operations.
+- If by-name fallback occurs (NYASH_LLVM_ALLOW_BY_NAME=1), the array methods might route to plugin-by-name with i64-only ABI and mismatched TLV types (index/value encoding).
+
+Plan
+
+1) Confirm lowering branch for BoxCall(ArrayBox.get/set) always selects NyRT shims under LLVM, regardless of by-name flag.
+2) If by-name fallback is unavoidable in current scenario, ensure integer index/value are encoded/tagged correctly (tag=3 for i64) and receiver is a handle.
+3) Add a targeted smoke (OFF by default) that calls only `get/set/length` and prints deterministic result.
+4) Optional: Add debug env `NYASH_PLUGIN_TLV_DUMP=1` to print decoded TLV for failing invokes to speed diagnosis.
+
+Workarounds
+
+- Keep `NYASH_LLVM_ARRAY_SMOKE=0` in CI until fixed.
+