chore: agent-browser vars

Signed-off-by: Dmytro Stanchiev <git@dmytros.dev>

.envrc

@@ -1,4 +1,7 @@
 export DIRENV_WARN_TIMEOUT=20s
+export AGENT_BROWSER_EXECUTABLE_PATH=/run/current-system/sw/bin/google-chrome-unstable
+export AGENT_BROWSER_ENGINE=chrome
+export AGENT_BROWSER_HEADED=0
 export OPENCODE_CONFIG_CONTENT="{\"plugin\":[\"superpowers@git+https://github.com/obra/superpowers.git\"]}"
 
 eval "$(devenv direnvrc)"