Update user agent install prompt for published headless Linux package

README.md

@@ -107,7 +107,8 @@ Install searchi on this computer and get it ready for my first search.
 Official repository: https://tea.karlcom.de/karl/searchi
 
 Detect my operating system and processor architecture. Use a suitable official
-release from the README or releases page, including the initial Windows release,
+release from the README or releases page, including the Windows installer or
+compatible Linux headless archive. Check its documented system requirements,
 verifying its published checksums. Otherwise,
 set up the current source version using the repository's installation/build
 instructions. Handle the required tools and dependencies for me; don't just
@@ -127,13 +128,15 @@ a working installation until it is verified. Ask for my help only when a
 password, system approval or other manual action is required.
 
 Let me choose which folders to index. Keep search local and optional cloud
-summaries disabled. Finish by showing me how to add a folder and try a filename
-search followed by a search in my own words.
+summaries disabled. On desktop, show me how to add a folder; on headless Linux,
+prepare the chosen folder through the CLI. Finish with a filename search
+followed by a search in my own words.
 ```
 
 Your agent needs internet access and permission to install software locally.
-Windows x64 setup can use the published installer; other platforms currently
-build from source. The local search model downloads approximately **865 MB**
+Windows x64 setup can use the published installer; compatible headless Linux
+systems can use the preview archive. Other platforms currently build from
+source. The local search model downloads approximately **865 MB**
 once, and cached assets are reused. Your agent should report any platform
 limitation it encounters.