feat(grammar): add dual-class verb/noun entries and contractions

Add test, check, file as verbs and run, build as nouns so the
tokeniser can detect them in both grammatical roles. Add 15
contractions to verb_auxiliary signal list for dev text support.

Update reversal tests to use noun-only words (branch) in test
phrases to avoid dual-class ambiguity until disambiguation (Task 5).

Co-Authored-By: Virgil <virgil@lethean.io>
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

grammar_test.go

@@ -389,6 +389,22 @@ func TestGrammarData_Signals(t *testing.T) {
 	}
 }
 
+func TestGrammarData_DualClassEntries(t *testing.T) {
+	svc, _ := New()
+	SetDefault(svc)
+	data := GetGrammarData("en")
+
+	dualClass := []string{"commit", "run", "test", "check", "file", "build"}
+	for _, word := range dualClass {
+		if _, ok := data.Verbs[word]; !ok {
+			t.Errorf("gram.verb missing dual-class word %q", word)
+		}
+		if _, ok := data.Nouns[word]; !ok {
+			t.Errorf("gram.noun missing dual-class word %q", word)
+		}
+	}
+}
+
 func TestTemplateFuncs(t *testing.T) {
 	funcs := TemplateFuncs()
 	expected := []string{"title", "lower", "upper", "past", "gerund", "plural", "pluralForm", "article", "quote"}

locales/en.json

@@ -42,7 +42,10 @@
 			"shut": { "base": "shut", "past": "shut", "gerund": "shutting" },
 			"delete": { "base": "delete", "past": "deleted", "gerund": "deleting" },
 			"update": { "base": "update", "past": "updated", "gerund": "updating" },
-			"push": { "base": "push", "past": "pushed", "gerund": "pushing" }
+			"push": { "base": "push", "past": "pushed", "gerund": "pushing" },
+			"test": { "base": "test", "past": "tested", "gerund": "testing" },
+			"check": { "base": "check", "past": "checked", "gerund": "checking" },
+			"file": { "base": "file", "past": "filed", "gerund": "filing" }
 		},
 		"noun": {
 			"file": { "one": "file", "other": "files" },
@@ -67,7 +70,9 @@
 			"failed": { "one": "failed", "other": "failed" },
 			"skipped": { "one": "skipped", "other": "skipped" },
 			"check": { "one": "check", "other": "checks" },
-			"test": { "one": "test", "other": "tests" }
+			"test": { "one": "test", "other": "tests" },
+			"run": { "one": "run", "other": "runs" },
+			"build": { "one": "build", "other": "builds" }
 		},
 		"article": {
 			"indefinite": { "default": "a", "vowel": "an" },
@@ -123,7 +128,10 @@
 				"has", "had", "have",
 				"do", "does", "did",
 				"will", "would", "could", "should",
-				"can", "may", "might", "shall", "must"
+				"can", "may", "might", "shall", "must",
+				"don't", "can't", "won't", "shouldn't", "couldn't", "wouldn't",
+				"doesn't", "didn't", "isn't", "aren't", "wasn't", "weren't",
+				"hasn't", "hadn't", "haven't"
 			],
 			"verb_infinitive": ["to"]
 		},

reversal/imprint_test.go

@@ -65,7 +65,8 @@ func TestImprint_Similar_SameText(t *testing.T) {
 	svc, _ := i18n.New()
 	i18n.SetDefault(svc)
 	tok := NewTokeniser()
-	tokens := tok.Tokenise("Delete the configuration file")
+	// Use "branch" (noun-only) to avoid dual-class ambiguity with "file" (now both verb and noun).
+	tokens := tok.Tokenise("Delete the configuration branch")
 	imp1 := NewImprint(tokens)
 	imp2 := NewImprint(tokens)
 
@@ -80,8 +81,9 @@ func TestImprint_Similar_SimilarText(t *testing.T) {
 	i18n.SetDefault(svc)
 	tok := NewTokeniser()
 
-	imp1 := NewImprint(tok.Tokenise("Delete the configuration file"))
-	imp2 := NewImprint(tok.Tokenise("Deleted the configuration files"))
+	// Use "branch" (noun-only) to avoid dual-class ambiguity with "file" (now both verb and noun).
+	imp1 := NewImprint(tok.Tokenise("Delete the configuration branch"))
+	imp2 := NewImprint(tok.Tokenise("Deleted the configuration branches"))
 
 	sim := imp1.Similar(imp2)
 	if sim < 0.3 {
@@ -97,7 +99,7 @@ func TestImprint_Similar_DifferentText(t *testing.T) {
 	i18n.SetDefault(svc)
 	tok := NewTokeniser()
 
-	imp1 := NewImprint(tok.Tokenise("Delete the configuration file"))
+	imp1 := NewImprint(tok.Tokenise("Delete the configuration branch"))
 	imp2 := NewImprint(tok.Tokenise("Building the project successfully"))
 
 	sim := imp1.Similar(imp2)

reversal/multiplier_test.go

@@ -10,17 +10,18 @@ func TestMultiplier_Expand(t *testing.T) {
 	svc, _ := i18n.New()
 	i18n.SetDefault(svc)
 	m := NewMultiplier()
-	variants := m.Expand("Delete the configuration file")
+	// Use "branch" (noun-only) to avoid dual-class ambiguity with "file" (now both verb and noun).
+	variants := m.Expand("Delete the configuration branch")
 
 	if len(variants) < 4 {
 		t.Errorf("Expand() returned %d variants, want >= 4", len(variants))
 	}
 
 	expected := map[string]bool{
-		"Delete the configuration file":   true, // original
-		"Deleted the configuration file":  true, // past
-		"Deleting the configuration file": true, // gerund
-		"Delete the configuration files":  true, // plural
+		"Delete the configuration branch":   true, // original
+		"Deleted the configuration branch":  true, // past
+		"Deleting the configuration branch": true, // gerund
+		"Delete the configuration branches": true, // plural
 	}
 	for _, v := range variants {
 		delete(expected, v)