feat: comprehensive test coverage improvement (16% → 80-90%)

.github/ISSUE_TEMPLATE/enhancement.md

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+---
+name: Enhancement Request
+about: Suggest an enhancement or new feature for cu CLI
+title: '[ENHANCEMENT] '
+labels: enhancement
+assignees: ''
+
+---
+
+## Enhancement Description
+A clear and concise description of the enhancement you'd like to see.
+
+## Use Case
+Describe the specific use case or problem this enhancement would solve.
+
+## Proposed Solution
+A clear and concise description of what you want to happen.
+
+## Alternatives Considered
+A clear and concise description of any alternative solutions or features you've considered.
+
+## Additional Context
+Add any other context, screenshots, or examples about the enhancement request here.
+
+## Impact
+- [ ] Breaking change (would cause existing functionality to not work as expected)
+- [ ] New feature (non-breaking change which adds functionality)
+- [ ] Performance improvement
+- [ ] Developer experience improvement
+- [ ] Documentation improvement
+
+## Implementation Considerations
+Any technical considerations, constraints, or implementation details that should be considered.

.github/coverage-exclusions.txt

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+# Coverage Exclusions
+# This file documents intentional coverage exclusions
+
+# Main entry point - trivial bootstrap code
+cmd/cu/main.go
+
+# Generated files
+*.pb.go
+*_generated.go
+
+# Test files themselves
+*_test.go

.github/problem-matchers/go-test.json

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+{
+  "problemMatcher": [
+    {
+      "owner": "go-test",
+      "pattern": [
+        {
+          "regexp": "^\\s*(.+\\.go):(\\d+):\\s+(.+)$",
+          "file": 1,
+          "line": 2,
+          "message": 3
+        }
+      ]
+    },
+    {
+      "owner": "go-panic",
+      "pattern": [
+        {
+          "regexp": "^panic: (.+)$",
+          "message": 1
+        },
+        {
+          "regexp": "^\\s+(.+\\.go):(\\d+)",
+          "file": 1,
+          "line": 2
+        }
+      ]
+    },
+    {
+      "owner": "go-test-fail",
+      "pattern": [
+        {
+          "regexp": "^\\s+([^:]+_test\\.go):(\\d+):",
+          "file": 1,
+          "line": 2
+        },
+        {
+          "regexp": "^\\s+Error:\\s+(.+)$",
+          "message": 1
+        }
+      ]
+    }
+  ]
+}

.github/scripts/test-summary.sh

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+#!/bin/bash
+
+# Parse test results and create a summary for GitHub Actions
+
+set -euo pipefail
+
+# Check if jq is available
+if ! command -v jq &> /dev/null; then
+    echo "jq is not available, installing..."
+    sudo apt-get update && sudo apt-get install -y jq || true
+fi
+
+JSON_FILE="${1:-test-results.json}"
+OUTPUT_FILE="${2:-$GITHUB_STEP_SUMMARY}"
+
+# Initialize counters
+total_tests=0
+passed_tests=0
+failed_tests=0
+skipped_tests=0
+
+# Arrays to store failures
+declare -a failures
+
+# Parse JSON test results
+if [[ -f "$JSON_FILE" ]]; then
+    while IFS= read -r line; do
+        # Skip empty lines
+        [[ -z "$line" ]] && continue
+
+        # Extract test information
+        action=$(echo "$line" | jq -r '.Action // empty' 2>/dev/null || echo "")
+        package=$(echo "$line" | jq -r '.Package // empty' 2>/dev/null || echo "")
+        test=$(echo "$line" | jq -r '.Test // empty' 2>/dev/null || echo "")
+        output=$(echo "$line" | jq -r '.Output // empty' 2>/dev/null || echo "")
+
+        case "$action" in
+            "pass")
+                ((passed_tests++))
+                ((total_tests++))
+                ;;
+            "fail")
+                if [[ -n "$test" ]]; then
+                    ((failed_tests++))
+                    ((total_tests++))
+                    failures+=("$package - $test")
+                fi
+                ;;
+            "skip")
+                ((skipped_tests++))
+                ((total_tests++))
+                ;;
+            "output")
+                # Only capture panic or error output from failed tests, not skipped ones
+                # Check if this output belongs to a failed test
+                if [[ -n "$test" ]] && [[ "$output" =~ "panic:" ]]; then
+                    failures+=("  └─ $output")
+                fi
+                ;;
+        esac
+    done < "$JSON_FILE"
+fi
+
+# Generate summary
+{
+    echo "## 📊 Test Results Summary"
+    echo ""
+    echo "| Metric | Count |"
+    echo "|--------|-------|"
+    echo "| Total Tests | $total_tests |"
+    echo "| ✅ Passed | $passed_tests |"
+    echo "| ❌ Failed | $failed_tests |"
+    echo "| ⏭️ Skipped | $skipped_tests |"
+    echo ""
+
+    if [[ $failed_tests -gt 0 ]]; then
+        echo "### ❌ Failed Tests"
+        echo ""
+        echo "<details>"
+        echo "<summary>Click to expand failed test details</summary>"
+        echo ""
+        echo '```'
+        for failure in "${failures[@]}"; do
+            echo "$failure"
+        done
+        echo '```'
+        echo "</details>"
+        echo ""
+    fi
+
+    # Calculate pass rate
+    if [[ $total_tests -gt 0 ]]; then
+        pass_rate=$(( (passed_tests * 100) / total_tests ))
+        echo "### 📈 Pass Rate: ${pass_rate}%"
+        echo ""
+
+        # Progress bar
+        echo "<div align=\"center\">"
+        echo ""
+        echo '```'
+        printf "["
+        filled=$(( pass_rate / 2 ))
+        for ((i=0; i<50; i++)); do
+            if [[ $i -lt $filled ]]; then
+                printf "█"
+            else
+                printf "░"
+            fi
+        done
+        printf "] %d%%\n" "$pass_rate"
+        echo '```'
+        echo ""
+        echo "</div>"
+    fi
+} >> "$OUTPUT_FILE"
+
+# Exit with error if tests failed
+if [[ $failed_tests -gt 0 ]]; then
+    exit 1
+fi