Fix linting issues: canonicalheader, embeddedstructfieldcheck, iotamixing, makezero, testableexamples, wastedassign, usetesting, tparallel, unconvert, intrange, iface

- canonicalheader: fix cacheTTL header value to canonical form
- embeddedstructfieldcheck: move embedded fields before regular fields in 4 structs
- iotamixing: split const blocks mixing iota with non-iota constants
- makezero: use make([]T, 0, n) instead of make([]T, n) before appending
- testableexamples: add missing Output: comment to ExampleOption_UnwrapOrZero
- wastedassign: remove wasted initial assignments in 4 locations
- usetesting: replace os.MkdirTemp/os.Setenv with t.TempDir/t.Setenv in tests
- tparallel: add t.Parallel() to 8 top-level test functions
- unconvert: remove 16 unnecessary type conversions
- intrange: convert 3 for loops to use integer range syntax
- iface: consolidate identical EditPrompter and Prompt interfaces via type alias

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

git/client_test.go

@@ -128,7 +128,7 @@ func TestClientRemotes(t *testing.T) {
 `
 	f, err := os.OpenFile(remoteFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0755)
 	assert.NoError(t, err)
-	_, err = f.Write([]byte(remotes))
+	_, err = f.WriteString(remotes)
 	assert.NoError(t, err)
 	err = f.Close()
 	assert.NoError(t, err)
@@ -165,7 +165,7 @@ func TestClientRemotes_no_resolved_remote(t *testing.T) {
 `
 	f, err := os.OpenFile(remoteFile, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0755)
 	assert.NoError(t, err)
-	_, err = f.Write([]byte(remotes))
+	_, err = f.WriteString(remotes)
 	assert.NoError(t, err)
 	err = f.Close()
 	assert.NoError(t, err)
@@ -1141,6 +1141,7 @@ func TestClientParsePushRevision(t *testing.T) {
 }
 
 func TestRemoteTrackingRef(t *testing.T) {
+	t.Parallel()
 	t.Run("parsing", func(t *testing.T) {
 		t.Parallel()
 
@@ -2098,6 +2099,7 @@ func TestCredentialPatternFromHost(t *testing.T) {
 }
 
 func TestPushDefault(t *testing.T) {
+	t.Parallel()
 	t.Run("it parses valid values correctly", func(t *testing.T) {
 		t.Parallel()
 

git/command_test.go

@@ -42,7 +42,6 @@ func TestOutput(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
-
 			cmd := Command{
 				&exec.Cmd{
 					Path: createMockExecutable(t, tt.stdout, tt.stderr, tt.exitCode),
@@ -87,7 +86,6 @@ func createMockExecutable(t *testing.T, stdout string, stderr string, exitCode i
 		t.Fatalf("failed to compile: %v\n%s", err, out)
 	}
 	return binaryPath
-
 }
 
 func buildCommandSourceCode(exitCode int, stdout, stderr string) string {