compose: add wrapper-first dogfood workspace (#1487)

docker/gateway.Dockerfile

@@ -29,11 +29,19 @@ ENV NODE_ENV=production
 # $MOSAIC_ROOT/.workspaces (apps/gateway/src/workspace/workspace.service.ts);
 # mount a volume over /opt/mosaic to persist workspaces across container restarts.
 # Intentionally unpinned: Alpine's signed repository is the trust anchor; pinning
-# git was declined so routine base-image security updates remain maintainable.
-RUN apk add --no-cache git \
+# packages was declined so routine base-image security updates remain maintainable.
+# bash/curl/python3 are runtime dependencies of the provider-neutral Mosaic git
+# wrappers. jq supports wrapper discovery for non-canonical Gitea hosts.
+RUN apk add --no-cache bash curl git jq python3 \
   && mkdir -p /opt/mosaic/.workspaces \
   && chown -R node:node /opt/mosaic /app
 ENV MOSAIC_ROOT=/opt/mosaic
+# Dogfood agents use the same fail-closed credential helper and PR wrappers as
+# fleet seats. The complete tools directory is copied because pr-create.sh shares
+# provider detection, declaration validation, and credential libraries with the
+# rest of the wrapper suite.
+COPY --from=builder /app/packages/mosaic/framework/tools /opt/mosaic/tools
+RUN git config --system credential.helper /opt/mosaic/tools/git/git-credential-mosaic
 # Use the pnpm deploy output — resolves all deps into a flat, self-contained node_modules
 COPY --chown=node:node --from=builder /deploy/node_modules ./node_modules
 COPY --chown=node:node --from=builder /deploy/package.json ./package.json