Remove ROOT_CAUSE_ANALYSIS.md and outdated server logs

crates/embeddings-engine/Dockerfile

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+# ---- Build stage ----
+FROM rust:1-slim-bullseye AS builder
+
+WORKDIR /usr/src/app
+
+# Install build dependencies
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        pkg-config \
+        libssl-dev \
+        build-essential \
+        && rm -rf /var/lib/apt/lists/*
+
+# Cache deps first
+COPY . ./
+RUN rm -rf src
+RUN mkdir src && echo "fn main() {}" > src/main.rs && echo "// lib" > src/lib.rs && cargo build --release
+RUN rm -rf src
+
+# Copy real sources and build
+COPY . .
+RUN cargo build --release
+
+# ---- Runtime stage ----
+FROM debian:bullseye-slim
+
+# Install only what the compiled binary needs
+RUN apt-get update && \
+    apt-get install -y --no-install-recommends \
+        libssl1.1 \
+        ca-certificates \
+        && rm -rf /var/lib/apt/lists/*
+
+# Copy binary from builder
+COPY --from=builder /usr/src/app/target/release/embeddings-engine /usr/local/bin/
+
+# Run as non-root user for safety
+RUN useradd -m appuser
+USER appuser
+
+EXPOSE 8080
+CMD ["embeddings-engine"]