chore: housekeeping and refactoring (bump to 4.7.1)

- Remove unused parameters, dead files, and inaccurate doc.go files
- Extract shared helpers, eliminate duplication
- Rename cheatpath.Cheatpath to cheatpath.Path
- Optimize filesystem walks (WalkDir, skip .git)
- Move sheet name validation to sheet.Validate
- Move integration tests to test/integration/
- Consolidate internal/mock into mocks/
- Move fuzz.sh to test/
- Inline loadSheets helper into command callers
- Extract config.New into its own file
- Fix stale references in HACKING.md and CLAUDE.md
- Restore plan9 build target
- Remove redundant and low-value tests
- Clean up project documentation

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

internal/cheatpath/cheatpath_test.go

@@ -8,13 +8,13 @@ import (
 func TestCheatpathValidate(t *testing.T) {
 	tests := []struct {
 		name      string
-		cheatpath Cheatpath
+		cheatpath Path
 		wantErr   bool
 		errMsg    string
 	}{
 		{
 			name: "valid cheatpath",
-			cheatpath: Cheatpath{
+			cheatpath: Path{
 				Name:     "personal",
 				Path:     "/home/user/.config/cheat/personal",
 				ReadOnly: false,
@@ -24,7 +24,7 @@ func TestCheatpathValidate(t *testing.T) {
 		},
 		{
 			name: "empty name",
-			cheatpath: Cheatpath{
+			cheatpath: Path{
 				Name:     "",
 				Path:     "/home/user/.config/cheat/personal",
 				ReadOnly: false,
@@ -35,7 +35,7 @@ func TestCheatpathValidate(t *testing.T) {
 		},
 		{
 			name: "empty path",
-			cheatpath: Cheatpath{
+			cheatpath: Path{
 				Name:     "personal",
 				Path:     "",
 				ReadOnly: false,
@@ -46,7 +46,7 @@ func TestCheatpathValidate(t *testing.T) {
 		},
 		{
 			name: "both empty",
-			cheatpath: Cheatpath{
+			cheatpath: Path{
 				Name:     "",
 				Path:     "",
 				ReadOnly: true,
@@ -57,7 +57,7 @@ func TestCheatpathValidate(t *testing.T) {
 		},
 		{
 			name: "minimal valid",
-			cheatpath: Cheatpath{
+			cheatpath: Path{
 				Name: "x",
 				Path: "/",
 			},
@@ -65,7 +65,7 @@ func TestCheatpathValidate(t *testing.T) {
 		},
 		{
 			name: "with readonly and tags",
-			cheatpath: Cheatpath{
+			cheatpath: Path{
 				Name:     "community",
 				Path:     "/usr/share/cheat",
 				ReadOnly: true,
@@ -88,26 +88,3 @@ func TestCheatpathValidate(t *testing.T) {
 		})
 	}
 }
-
-func TestCheatpathStruct(t *testing.T) {
-	// Test that the struct fields work as expected
-	cp := Cheatpath{
-		Name:     "test",
-		Path:     "/test/path",
-		ReadOnly: true,
-		Tags:     []string{"tag1", "tag2"},
-	}
-
-	if cp.Name != "test" {
-		t.Errorf("expected Name to be 'test', got %q", cp.Name)
-	}
-	if cp.Path != "/test/path" {
-		t.Errorf("expected Path to be '/test/path', got %q", cp.Path)
-	}
-	if !cp.ReadOnly {
-		t.Error("expected ReadOnly to be true")
-	}
-	if len(cp.Tags) != 2 || cp.Tags[0] != "tag1" || cp.Tags[1] != "tag2" {
-		t.Errorf("expected Tags to be [tag1 tag2], got %v", cp.Tags)
-	}
-}