Initial release of CHORUS Development Images

This commit establishes the foundation for language-specific development
container images used by CHORUS autonomous agents.

Features:
- Multi-stage Dockerfile with 7 layered images
- Base Debian Bookworm image with common tools
- Language-specific images: Rust, Go, Python, Node.js, Java, C/C++
- Standardized /workspace/{input,data,output} structure
- Automated CI/CD pipeline for weekly security updates
- Comprehensive test suite for all images
- Full documentation (README, USAGE, MAINTENANCE)

Images available:
- chorus/base:1.0.0 (~200MB)
- chorus/rust-dev:1.0.0 (~1.2GB)
- chorus/go-dev:1.0.0 (~600MB)
- chorus/python-dev:1.0.0 (~800MB)
- chorus/node-dev:1.0.0 (~700MB)
- chorus/java-dev:1.0.0 (~1.5GB)
- chorus/cpp-dev:1.0.0 (~900MB)

🤖 Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

tests/test-base.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+# Test script for base image
+
+set -e
+
+IMAGE="${REGISTRY:-registry.home.deepblack.cloud/chorus}/base:latest"
+
+echo "🧪 Testing base image: $IMAGE"
+
+# Test workspace structure
+echo "  ✓ Checking workspace directories..."
+docker run --rm "$IMAGE" test -d /workspace/input || exit 1
+docker run --rm "$IMAGE" test -d /workspace/data || exit 1
+docker run --rm "$IMAGE" test -d /workspace/output || exit 1
+
+# Test core utilities
+echo "  ✓ Checking core utilities..."
+docker run --rm "$IMAGE" git --version > /dev/null || exit 1
+docker run --rm "$IMAGE" curl --version > /dev/null || exit 1
+docker run --rm "$IMAGE" which vim > /dev/null || exit 1
+docker run --rm "$IMAGE" which jq > /dev/null || exit 1
+
+# Test user permissions
+echo "  ✓ Checking user permissions..."
+docker run --rm "$IMAGE" whoami | grep -q chorus || exit 1
+docker run --rm "$IMAGE" sh -c 'echo "test" > /workspace/data/test.txt && rm /workspace/data/test.txt' || exit 1
+
+# Test environment variables
+echo "  ✓ Checking environment variables..."
+docker run --rm "$IMAGE" sh -c 'test -n "$WORKSPACE_ROOT"' || exit 1
+docker run --rm "$IMAGE" sh -c 'test -n "$WORKSPACE_INPUT"' || exit 1
+docker run --rm "$IMAGE" sh -c 'test -n "$WORKSPACE_DATA"' || exit 1
+docker run --rm "$IMAGE" sh -c 'test -n "$WORKSPACE_OUTPUT"' || exit 1
+
+echo "✅ Base image tests passed"