Release 0.2.0: Phase 2 language intelligence

- AST-backed document outline, completion, hover, go-to-definition
  (lenient in-server Modula-2 parser, src/m2/)
- Coco/R validator diagnostics bridge wired to GNU-grammar/bin/GM2
  with modula2.cocoR.validatorCommand default set
- Reference grammar (Modula2.atg) and regression tests seeded

package.json

@@ -1,7 +1,7 @@
 {
   "private": true,
   "name": "modula2-ide",
-  "version": "0.1.7",
+  "version": "0.2.0",
   "description": "GNU Modula-2 IDE built on Eclipse Theia",
   "engines": {
     "node": ">=24",