Updated cthulhu build script. Should work on systems even with old versions of go.

AGENTS.md

@@ -36,7 +36,9 @@ Use `gofmt`, exported PascalCase identifiers, private camelCase identifiers, and
 
 Read [CONTRIBUTING.md](CONTRIBUTING.md) for detailed safeguards. Compare accepted behavior with Python on `legacy`; use current Orca as the primary reference for Mozilla and LibreOffice support. Follow [LIBREOFFICE_SUPPORT.md](LIBREOFFICE_SUPPORT.md) for Office integration boundaries. Preserve unrelated work and active diagnostic logs; obtain authorization before replacing a running reader.
 
-Fix regressions in the shared subsystem when appropriate. Identify state ownership, lifetime, reset, and cancellation; keep native callbacks and input/focus handling bounded. Preserve Xorg correctness while allowing capability-based Wayland degradation. Keep Tentacles external and responsive.
+Fix regressions in the shared subsystem when appropriate. Identify state ownership, lifetime, reset, and cancellation; keep native callbacks and input/focus handling bounded. Keep Tentacles external and responsive.
+
+X11/Xorg is the primary supported display environment. Wayland support is secondary and must not regress Xorg behavior. Xorg regressions are critical blockers for merging and release. If a Wayland change cannot preserve Xorg correctness, defer that change. Use capability checks and graceful degradation for Wayland support.
 
 Prefer core Go implementations for features users expect from the reader itself; use Tentacles for extensions.