feat: add standardized testing scripts and documentation

Add comprehensive suite of testing scripts for different workflows:
- test.sh: Interactive menu for all testing operations
- quick_test.sh: Fast unit test feedback (~10-30s)
- run_tests.sh: Main test runner with full configuration options
- coverage_report.sh: Coverage analysis with HTML/JSON/terminal reports
- ci_test.sh: CI/CD optimized testing with JUnit/coverage XML output

Features:
- Colored terminal output with clear error messages
- Consistent option flags across all scripts
- Support for test markers (unit, integration, e2e, slow, etc.)
- Parallel execution support
- Coverage thresholds (default: 85%)
- Virtual environment and dependency checks

Documentation:
- Update CLAUDE.md with testing section and examples
- Expand docs/developer/testing.md with comprehensive guide
- Add scripts/README.md with quick reference

All scripts are tested and executable. This standardizes the testing
process for local development, CI/CD, and pull request workflows.

scripts/quick_test.sh

@@ -0,0 +1,59 @@
+#!/bin/bash
+# AI-Trader Quick Test Script
+# Fast test run for rapid feedback during development
+
+set -e
+
+# Colors for output
+RED='\033[0;31m'
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+BLUE='\033[0;34m'
+NC='\033[0m' # No Color
+
+# Script directory
+SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+
+echo -e "${BLUE}========================================${NC}"
+echo -e "${BLUE}AI-Trader Quick Test${NC}"
+echo -e "${BLUE}========================================${NC}"
+echo ""
+echo -e "${YELLOW}Running unit tests (no coverage, fail-fast)${NC}"
+echo ""
+
+# Change to project root
+cd "$PROJECT_ROOT"
+
+# Check if virtual environment exists
+if [ ! -d "./venv" ]; then
+    echo -e "${RED}Error: Virtual environment not found${NC}"
+    echo -e "${YELLOW}Please run: python3 -m venv venv && ./venv/bin/pip install -r requirements.txt${NC}"
+    exit 1
+fi
+
+# Run unit tests only, no coverage, fail on first error
+./venv/bin/python -m pytest tests/ \
+    -v \
+    -m "unit and not slow" \
+    -x \
+    --tb=short \
+    --no-cov
+
+TEST_EXIT_CODE=$?
+
+echo ""
+if [ $TEST_EXIT_CODE -eq 0 ]; then
+    echo -e "${GREEN}========================================${NC}"
+    echo -e "${GREEN}✓ Quick tests passed!${NC}"
+    echo -e "${GREEN}========================================${NC}"
+    echo ""
+    echo -e "${YELLOW}For full test suite with coverage, run:${NC}"
+    echo "  bash scripts/run_tests.sh"
+else
+    echo -e "${RED}========================================${NC}"
+    echo -e "${RED}✗ Quick tests failed${NC}"
+    echo -e "${RED}========================================${NC}"
+fi
+
+exit $TEST_EXIT_CODE