fix: remove build script

Dockerfile

@@ -3,11 +3,9 @@ ARG TEA_VERSION=0.14.2
 FROM node:24-bookworm-slim AS agent-tools
 
 ARG CODEGRAPH_VERSION=1.3.1
-ARG OPENCODE_REFRESH
-RUN test -n "$OPENCODE_REFRESH" \
-    || { echo "OPENCODE_REFRESH is required; run scripts/build.sh" >&2; exit 1; } \
-    && npm install --global \
-    'opencode-ai@^1' \
+ARG AGENTCI_OPENCODE_VERSION=^1
+RUN npm install --global \
+    "opencode-ai@${AGENTCI_OPENCODE_VERSION}" \
     "@colbymchenry/codegraph@${CODEGRAPH_VERSION}" \
     && version="$(opencode --version)" \
     && case "$version" in 1.*) ;; *) echo "Expected OpenCode 1.x, got $version" >&2; exit 1;; esac