fix(D19/T52): wire Grammar-Kit generateLexer/generateParser; regenerate src/main/gen

- Add org.jetbrains.grammarkit 2022.3.2.2 plugin to build.gradle.kts
- Wire generateLexer (Baboon.flex → gen/language/BaboonLexer.java) and
  generateParser (Baboon.bnf → gen/) tasks; compileKotlin/compileJava depend on them
- Regenerate gen: BaboonTypes.java now defines KW_ID, KW_HAS, KW_MIRROR,
  KW_PRAGMA, KW_TYPE (fixes unresolved-reference errors in BaboonTokenType.kt)
- New PSI types generated: BaboonExtractionDef, BaboonIdDef, BaboonPragma,
  BaboonPragmaKey, BaboonTemplateHead, BaboonTypeAlias (and Impl counterparts)
- Updated BaboonParser.java from stale idealingua-era version to current BNF

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: pshirshov

build.gradle.kts

@@ -7,6 +7,7 @@ plugins {
     id("org.jetbrains.kotlin.jvm") version "2.2.0"
     id("org.jetbrains.intellij.platform") version "2.7.2"
     id("org.jetbrains.changelog") version "2.4.0"
+    id("org.jetbrains.grammarkit") version "2022.3.2.2"
 }
 
 group = "io.septimalmind.baboon"
@@ -77,6 +78,28 @@ tasks {
         sourceCompatibility = "21"
         targetCompatibility = "21"
     }
+
+    generateLexer {
+        sourceFile.set(file("src/main/grammar/Baboon.flex"))
+        targetOutputDir.set(file("src/main/gen/io/septimalmind/baboon/baboonintellij/language"))
+        purgeOldFiles.set(true)
+    }
+
+    generateParser {
+        sourceFile.set(file("src/main/grammar/Baboon.bnf"))
+        targetRootOutputDir.set(file("src/main/gen"))
+        pathToParser.set("io/septimalmind/baboon/baboonintellij/language/BaboonParser.java")
+        pathToPsiRoot.set("io/septimalmind/baboon/baboonintellij/psi")
+        purgeOldFiles.set(false)
+    }
+
+    compileKotlin {
+        dependsOn(generateLexer, generateParser)
+    }
+
+    compileJava {
+        dependsOn(generateLexer, generateParser)
+    }
 }
 
 sourceSets["main"].java.srcDir("src/main/gen")