move claude-marketplace to ai-proj-helper

plugins/session-plugin/.claude-plugin/plugin.json

@@ -0,0 +1,8 @@
+{
+  "name": "session-plugin",
+  "description": "Manage Claude Code sessions — save, reload, read, and search saved conversations. Triggers on /session commands or when user mentions saving session, reloading session, finding previous conversations, or continuing previous work.",
+  "version": "1.0.0",
+  "author": {
+    "name": "qiudl"
+  }
+}