tools(hako-check): add lightweight script checker (parse→MIR verify) + README; uses nyash --backend mir --verify

tools/hako-check/README.md

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+Hakorune Script Checker (MVP)
+
+Purpose
+- Quickly validate Hakorune source files by parsing → MIR build → MIR verify without executing.
+- Useful while Python/llvmlite migration is in-flight to keep scripts healthy.
+
+Usage
+- Build nyash:
+  - cargo build --release
+- Run checker:
+  - tools/hako-check/hako-check.sh path/to/file.hako
+
+Behavior
+- Runs: nyash --backend mir --verify <file>
+- Exit codes:
+  - 0: OK
+  - 2+: Parse/MIR verify failure (nyash returns non‑zero; checker forwards)
+
+Notes
+- This MVP only checks a single file and depends on the Rust parser.
+- Extend with flags (parser selection, JSON emit) as migration progresses.
+

tools/hako-check/hako-check.sh

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+#!/usr/bin/env bash
+set -euo pipefail
+
+if [[ $# -lt 1 ]]; then
+  echo "usage: tools/hako-check/hako-check.sh <file.hako>" >&2
+  exit 1
+fi
+
+ROOT_DIR="$(cd "$(dirname "$0")/../.." && pwd)"
+BIN="$ROOT_DIR/target/release/nyash"
+FILE="$1"
+
+if [[ ! -x "$BIN" ]]; then
+  echo "[info] building nyash (release) ..." >&2
+  cargo build --release -q
+fi
+
+if [[ ! -f "$FILE" ]]; then
+  echo "error: file not found: $FILE" >&2
+  exit 2
+fi
+
+# Parse → MIR build → verify (no execute)
+"$BIN" --backend mir --verify "$FILE"
+echo "OK: $FILE"
+