Revert "feat(ecc): prune plugin 43→12 items, promote 7 rules to .claude/rules/ (#245)"

This reverts commit 1bd68ff534.

.opencode/commands/go-test.md

@@ -0,0 +1,131 @@
+---
+description: Go TDD workflow with table-driven tests
+agent: tdd-guide
+subtask: true
+---
+
+# Go Test Command
+
+Implement using Go TDD methodology: $ARGUMENTS
+
+## Your Task
+
+Apply test-driven development with Go idioms:
+
+1. **Define types** - Interfaces and structs
+2. **Write table-driven tests** - Comprehensive coverage
+3. **Implement minimal code** - Pass the tests
+4. **Benchmark** - Verify performance
+
+## TDD Cycle for Go
+
+### Step 1: Define Interface
+```go
+type Calculator interface {
+    Calculate(input Input) (Output, error)
+}
+
+type Input struct {
+    // fields
+}
+
+type Output struct {
+    // fields
+}
+```
+
+### Step 2: Table-Driven Tests
+```go
+func TestCalculate(t *testing.T) {
+    tests := []struct {
+        name    string
+        input   Input
+        want    Output
+        wantErr bool
+    }{
+        {
+            name:  "valid input",
+            input: Input{...},
+            want:  Output{...},
+        },
+        {
+            name:    "invalid input",
+            input:   Input{...},
+            wantErr: true,
+        },
+    }
+
+    for _, tt := range tests {
+        t.Run(tt.name, func(t *testing.T) {
+            got, err := Calculate(tt.input)
+            if (err != nil) != tt.wantErr {
+                t.Errorf("Calculate() error = %v, wantErr %v", err, tt.wantErr)
+                return
+            }
+            if !reflect.DeepEqual(got, tt.want) {
+                t.Errorf("Calculate() = %v, want %v", got, tt.want)
+            }
+        })
+    }
+}
+```
+
+### Step 3: Run Tests (RED)
+```bash
+go test -v ./...
+```
+
+### Step 4: Implement (GREEN)
+```go
+func Calculate(input Input) (Output, error) {
+    // Minimal implementation
+}
+```
+
+### Step 5: Benchmark
+```go
+func BenchmarkCalculate(b *testing.B) {
+    input := Input{...}
+    for i := 0; i < b.N; i++ {
+        Calculate(input)
+    }
+}
+```
+
+## Go Testing Commands
+
+```bash
+# Run all tests
+go test ./...
+
+# Run with verbose output
+go test -v ./...
+
+# Run with coverage
+go test -cover ./...
+
+# Run with race detector
+go test -race ./...
+
+# Run benchmarks
+go test -bench=. ./...
+
+# Generate coverage report
+go test -coverprofile=coverage.out ./...
+go tool cover -html=coverage.out
+```
+
+## Test File Organization
+
+```
+package/
+├── calculator.go       # Implementation
+├── calculator_test.go  # Tests
+├── testdata/           # Test fixtures
+│   └── input.json
+└── mock_test.go        # Mock implementations
+```
+
+---
+
+**TIP**: Use `testify/assert` for cleaner assertions, or stick with stdlib for simplicity.