fix: Enforce min_chunk_size in RAG chunker

- Filter out chunks smaller than min_chunk_size (default 100 tokens)
- Exception: Keep all chunks if entire document is smaller than target size
- All 15 tests passing (100% pass rate)

Fixes edge case where very small chunks (e.g., 'Short.' = 6 chars) were
being created despite min_chunk_size=100 setting.

Test: pytest tests/test_rag_chunker.py -v

Dockerfile

@@ -0,0 +1,75 @@
+# Skill Seekers - Multi-stage Docker Build
+# Optimized for production deployment with minimal image size
+
+# Stage 1: Builder - Install dependencies and build
+FROM python:3.12-slim as builder
+
+WORKDIR /build
+
+# Install build dependencies
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    gcc \
+    g++ \
+    git \
+    && rm -rf /var/lib/apt/lists/*
+
+# Copy dependency files
+COPY pyproject.toml README.md ./
+COPY src/ src/
+
+# Install dependencies and build package
+RUN pip install --no-cache-dir --upgrade pip uv && \
+    uv pip install --system --no-cache -e . && \
+    uv pip install --system --no-cache ".[all-llms]"
+
+# Stage 2: Runtime - Minimal production image
+FROM python:3.12-slim
+
+LABEL maintainer="Skill Seekers <noreply@skillseekers.dev>"
+LABEL description="Skill Seekers - Convert documentation to AI skills"
+LABEL version="2.9.0"
+
+# Install runtime dependencies only
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    git \
+    curl \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create non-root user
+RUN useradd -m -u 1000 -s /bin/bash skillseeker && \
+    mkdir -p /app /data /configs /output && \
+    chown -R skillseeker:skillseeker /app /data /configs /output
+
+WORKDIR /app
+
+# Copy Python packages from builder
+COPY --from=builder /usr/local/lib/python3.12/site-packages /usr/local/lib/python3.12/site-packages
+COPY --from=builder /usr/local/bin/skill-seekers* /usr/local/bin/
+
+# Copy application code
+COPY --chown=skillseeker:skillseeker src/ src/
+COPY --chown=skillseeker:skillseeker configs/ configs/
+COPY --chown=skillseeker:skillseeker pyproject.toml README.md ./
+
+# Switch to non-root user
+USER skillseeker
+
+# Set environment variables
+ENV PYTHONUNBUFFERED=1 \
+    PYTHONDONTWRITEBYTECODE=1 \
+    PATH="/home/skillseeker/.local/bin:$PATH" \
+    SKILL_SEEKERS_HOME=/data \
+    SKILL_SEEKERS_OUTPUT=/output
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
+    CMD skill-seekers --version || exit 1
+
+# Default volumes
+VOLUME ["/data", "/configs", "/output"]
+
+# Expose MCP server port (HTTP mode)
+EXPOSE 8765
+
+# Default command - show help
+CMD ["skill-seekers", "--help"]