Adopt strict plugin entry module and otp_app conventions

README.md

@@ -67,7 +67,7 @@ your_plugin/
 ```json
 {
   "name": "your_plugin",
-  "entry_module": "YourPlugin.Plugin",
+  "entry_module": "Tribes.Plugins.YourPlugin.Plugin",
   "host_api": "1",
   "otp_app": "your_plugin",
   "provides": ["some_capability@1"],
@@ -76,6 +76,8 @@ your_plugin/
 }
 ```
 
+- **entry_module** — must be `Tribes.Plugins.*.Plugin`
+- **otp_app** — required and must match `name`
 - **provides** — capabilities this plugin makes available
 - **requires** — hard dependencies (build fails without them)
 - **enhances_with** — optional dependencies (plugin degrades gracefully)