📝 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>

features/bdd_test.go

@@ -11,7 +11,7 @@ func TestBDD(t *testing.T) {
 	suite := godog.TestSuite{
 		Name:                 "DanceLessonsCoach BDD Tests",
 		TestSuiteInitializer: bdd.InitializeTestSuite,
-		ScenarioInitializer:   bdd.InitializeScenario,
+		ScenarioInitializer:  bdd.InitializeScenario,
 		Options: &godog.Options{
 			Format:   "progress",
 			Paths:    []string{"."},
@@ -22,4 +22,4 @@ func TestBDD(t *testing.T) {
 	if suite.Run() != 0 {
 		t.Fatal("non-zero status returned, failed to run BDD tests")
 	}
-}
+}