feat(remote): unify remote execution workflow with env-based config

- Replace hardcoded SSH/docker targets with environment variables
- Add remote-check, remote-dry, remote-test, remote-test-one recipes
- Add remote cmd for arbitrary command execution in docker container

.opencode/opencode.json

@@ -0,0 +1,9 @@
+{
+  "$schema": "https://opencode.ai/config.json",
+  "permission": {
+    "bash": {
+      "make": "deny",
+      "make *": "deny"
+    }
+  }
+}