📝 docs: add ADR for staged-only Git hooks formatting

- Add ADR-0012 documenting the decision to format only staged Go files
- Update ADR README.md with new entry
- Document rationale, alternatives, and verification results
- Include future considerations for monitoring and CI/CD integration

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

pkg/greet/api_v2.go

@@ -4,9 +4,9 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
-	"strconv"
 	"io"
 	"net/http"
+	"strconv"
 
 	"DanceLessonsCoach/pkg/validation"
 	"github.com/go-chi/chi/v5"
@@ -22,7 +22,7 @@ type ApiV2Greet interface {
 }
 
 type apiV2GreetHandler struct {
-	greeter    GreeterV2
+	greeter   GreeterV2
 	validator *validation.Validator
 }
 
@@ -108,4 +108,4 @@ func (h *apiV2GreetHandler) handleValidationError(w http.ResponseWriter, err err
 func (h *apiV2GreetHandler) writeJSONResponse(w http.ResponseWriter, message string) {
 	w.Header().Set("Content-Type", "application/json")
 	json.NewEncoder(w).Encode(greetResponse{Message: message})
-}
+}

pkg/greet/greet.go

@@ -21,4 +21,4 @@ func (s *Service) Greet(ctx context.Context, name string) string {
 		return "Hello world!"
 	}
 	return "Hello " + name + "!"
-}
+}

pkg/greet/greet_v2.go

@@ -21,4 +21,4 @@ func (s *ServiceV2) GreetV2(ctx context.Context, name string) string {
 		return "Hello my friend!"
 	}
 	return "Hello my friend " + name + "!"
-}
+}

pkg/greet/greet_v2_test.go

@@ -25,4 +25,4 @@ func TestServiceV2_GreetV2(t *testing.T) {
 			}
 		})
 	}
-}
+}