restructure: move el compiler content into lang/

lang/tests/text/runner.el

@@ -0,0 +1,11 @@
+// runner.el — entry point for the text/ acceptance corpus.
+//
+// Each text/examples/*.el is its own El program with its own fn main().
+// Compile, link, and run-output-diff is handled by tests/text/run.sh —
+// this file is the El-side stub kept for pattern parity with tests/time/
+// and tests/calendar/.
+
+fn main() -> Void {
+    println("text/ acceptance corpus is driven by run.sh — invoke that directly.")
+    println("Each examples/*.el is a self-contained program; runner.el is a parity stub.")
+}