public: publish selfhost snapshot to public repo (SSOT using + AST merge + JSON VM fixes)

- SSOT using profiles (aliases/packages via nyash.toml), AST prelude merge
- Parser/member guards; Builder pin/PHI and instance→function rewrite (dev on)
- VM refactors (handlers split) and JSON roundtrip/nested stabilization
- CURRENT_TASK.md updated with scope and acceptance criteria

Notes: dev-only guards remain togglable via env; no default behavior changes for prod.

src/runtime/plugin_loader_v2/enabled/extern_functions.rs

@@ -33,8 +33,13 @@ pub fn extern_call(
 fn handle_console(method_name: &str, args: &[Box<dyn NyashBox>]) -> BidResult<Option<Box<dyn NyashBox>>> {
     match method_name {
         "log" => {
+            let trace = std::env::var("NYASH_CONSOLE_TRACE").ok().as_deref() == Some("1");
             for a in args {
-                println!("{}", a.to_string_box().value);
+                let s = a.to_string_box().value;
+                if trace {
+                    eprintln!("[console.trace] len={} text=<{:.64}>", s.len(), s);
+                }
+                println!("{}", s);
             }
             Ok(None)
         }
@@ -259,4 +264,4 @@ mod tests {
         let result = extern_call("unknown.interface", "method", &args);
         assert!(matches!(result, Err(BidError::PluginError)));
     }
-}
+}