server content features improved

docs/modules/SERVER_CONTENT_MANAGER.md

@@ -33,10 +33,31 @@ The module can already represent several content types, including:
 - downloads/extracted packages
 - post-script driven installs
 - config packs
+- server-side applications with lifecycle hooks
 - future profile-type content
 
 Steam Workshop is no longer a user-facing Server Content category. Workshop access belongs to the dedicated `steam_workshop` module.
 
+## Server-Side Applications
+
+`Server-side Application` content writes an agent-readable hook manifest under
+the target game home:
+
+```text
+_gsp_content/hooks/<app>.json
+```
+
+The agents generate runtime watchdog scripts in `_gsp_content/generated/` and
+track side-application PIDs in `_gsp_content/runtime/server_content.pids`.
+
+Use this type for companion applications such as BEC, Big Brother Bot, Discord
+bridges, RCON tools, and log watchers. The application files themselves may
+still be installed wherever the game requires them.
+
+Detailed lifecycle documentation:
+
+- `docs/features/SERVER_CONTENT_APPLICATION_HOOKS.md`
+
 ## Current Limitations
 
 - Cache and cleanup policy need a clearer product design.
@@ -56,6 +77,7 @@ This module is the right place for:
 - add-ons
 - config packs
 - script-driven installs
+- server-side companion application hooks
 - server content manifests
 - install history