feat: add skill registry with tool routing

internal/registry/registry_test.go

@@ -0,0 +1,51 @@
+package registry_test
+
+import (
+	"context"
+	"encoding/json"
+	"testing"
+
+	"github.com/mathiasbq/supervisor/internal/registry"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+type stubSkill struct {
+	name string
+}
+
+func (s stubSkill) Name() string { return s.name }
+func (s stubSkill) Tools() []registry.ToolDef {
+	return []registry.ToolDef{{
+		Name:        s.name + "_tool",
+		Description: "stub tool",
+		InputSchema: json.RawMessage(`{"type":"object","properties":{}}`),
+	}}
+}
+func (s stubSkill) Handle(ctx context.Context, tool string, args json.RawMessage) (json.RawMessage, error) {
+	return json.RawMessage(`{"ok":true}`), nil
+}
+
+func TestRegistryRoutes(t *testing.T) {
+	r := registry.New()
+	r.Register(stubSkill{name: "tdd"})
+
+	result, err := r.Dispatch(context.Background(), "tdd_tool", json.RawMessage(`{}`))
+	require.NoError(t, err)
+	assert.JSONEq(t, `{"ok":true}`, string(result))
+}
+
+func TestRegistryUnknownTool(t *testing.T) {
+	r := registry.New()
+	_, err := r.Dispatch(context.Background(), "unknown_tool", json.RawMessage(`{}`))
+	assert.ErrorContains(t, err, "unknown tool")
+}
+
+func TestRegistryListsTools(t *testing.T) {
+	r := registry.New()
+	r.Register(stubSkill{name: "tdd"})
+
+	tools := r.Tools()
+	require.Len(t, tools, 1)
+	assert.Equal(t, "tdd_tool", tools[0].Name)
+}