feat: add Junie platform support with .agents/skills target

Co-authored-by: Junie <junie@jetbrains.com>

tools/installer/ide/platform-codes.yaml

@@ -102,6 +102,13 @@ platforms:
         - .iflow/commands
       target_dir: .iflow/skills
 
+  junie:
+    name: "Junie"
+    preferred: false
+    installer:
+      target_dir: .agents/skills
+      ancestor_conflict_check: true
+
   kilo:
     name: "KiloCoder"
     preferred: false

tools/platform-codes.yaml

@@ -127,6 +127,12 @@ platforms:
     category: ide
     description: "AI-powered IDE with cascade flows"
 
+  junie:
+    name: "Junie"
+    preferred: false
+    category: cli
+    description: "AI coding agent by JetBrains"
+
   ona:
     name: "Ona"
     preferred: false