hv1: early-exit at main (no plugin init); tokenizer: Stage-3 single-quote + full escapes (\/ \b \f \' \r fix); builder: route BinOp via SSOT emit_binop_to_dst; hv1 verify canary route (builder→Core); docs: phase-20.39 updates

src/runner/core_executor.rs

@@ -15,7 +15,7 @@
 use super::NyashRunner;
 use std::io::Write;
 
-pub(crate) fn run_json_v0(runner: &NyashRunner, json: &str) -> i32 {
+pub fn run_json_v0(runner: &NyashRunner, json: &str) -> i32 {
     // Optional: direct Core Dispatcher via child nyash (boxed)
     // Toggle: HAKO_CORE_DIRECT=1 (alias: NYASH_CORE_DIRECT)
     let core_direct = std::env::var("HAKO_CORE_DIRECT").ok().as_deref() == Some("1")
@@ -39,6 +39,26 @@ pub(crate) fn run_json_v0(runner: &NyashRunner, json: &str) -> i32 {
     }
     let mut payload = json.to_string();
 
+    // Fast-path: accept MIR(JSON v0) directly when it looks like a module (functions/blocks)
+    if payload.contains("\"functions\"") && payload.contains("\"blocks\"") {
+        match super::mir_json_v0::parse_mir_v0_to_module(&payload) {
+            Ok(module) => {
+                super::json_v0_bridge::maybe_dump_mir(&module);
+                crate::runner::child_env::pre_run_reset_oob_if_strict();
+                let rc = runner.execute_mir_module_quiet_exit(&module);
+                if crate::config::env::oob_strict_fail() && crate::runtime::observe::oob_seen() {
+                    eprintln!("[gate-c][oob-strict] Out-of-bounds observed → exit(1)");
+                    return 1;
+                }
+                return rc;
+            }
+            Err(e) => {
+                eprintln!("❌ MIR JSON v0 parse error: {}", e);
+                return 1;
+            }
+        }
+    }
+
     // Always try the v1 bridge first (Stage‑B Program JSON → MIR module).
     // This is no‑op when input is already MIR(JSON v0) with functions/blocks.
     if let Ok(j) = crate::runner::modes::common_util::core_bridge::canonicalize_module_json(&payload) {