feat: add agent canvas, collaboration, and IAM auth to control plane

- Add agent canvas with visual node editor, chat view, and collaboration cursors
- Add real-time collaboration infrastructure (contexts, hooks, presence)
- Add command palette, spaces, terminal panel, and side chat components
- Add IAM auth middleware and route handlers for server
- Add Hanzo branding (favicons, config, navigation updates)
- Update AuthContext/AuthGuard with enhanced auth flow
- Update Dockerfile and Makefile for control-plane builds
- Rebrand UI references and update dependencies across web client

deployments/docker/Dockerfile.control-plane

@@ -18,6 +18,8 @@ RUN apt-get update && apt-get install -y --no-install-recommends \
     pkg-config \
     gcc-aarch64-linux-gnu \
     libc6-dev-arm64-cross \
+    gcc-x86-64-linux-gnu \
+    libc6-dev-amd64-cross \
     && rm -rf /var/lib/apt/lists/*
 
 COPY control-plane/go.mod control-plane/go.sum ./control-plane/
@@ -27,7 +29,9 @@ COPY control-plane/ ./control-plane/
 COPY --from=ui-builder /app/web/dist ./control-plane/web/client/dist
 
 RUN cd control-plane && \
-    if [ "${TARGETARCH}" = "arm64" ]; then export CC=aarch64-linux-gnu-gcc; else export CC=gcc; fi && \
+    if [ "${TARGETARCH}" = "arm64" ]; then export CC=aarch64-linux-gnu-gcc; \
+    elif [ "${TARGETARCH}" = "amd64" ] && [ "$(uname -m)" != "x86_64" ]; then export CC=x86_64-linux-gnu-gcc; \
+    else export CC=gcc; fi && \
     GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -tags "embedded sqlite_fts5" -o /app/bin/hanzo-agents-server ./cmd/hanzo-agents-server
 
 # Pre-create writable data directory for distroless runtime. The nonroot user