Enterprise release: add self-updates, command signing, and telemetry enhancements

Dockerfile

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+# Multi-stage build for minimal runtime image
+FROM golang:1.23-alpine AS builder
+
+# Install build dependencies
+RUN apk add --no-cache git
+
+WORKDIR /app
+COPY go.mod go.sum ./
+RUN go mod download
+
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux go build -v -o theta-agent .
+
+# Final runtime image
+FROM alpine:latest
+RUN apk add --no-cache ca-certificates
+
+WORKDIR /
+
+# Create config directory
+RUN mkdir -p /etc/theta42
+
+COPY --from=builder /app/theta-agent /usr/local/bin/theta-agent
+
+# Run as root for system management
+USER root
+
+ENTRYPOINT ["/usr/local/bin/theta-agent"]