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>

pkg/search/query.go

@@ -238,7 +238,7 @@ func (q Qualifiers) Map() map[string][]string {
 	m := map[string][]string{}
 	v := reflect.ValueOf(q)
 	t := reflect.TypeOf(q)
-	for i := 0; i < v.NumField(); i++ {
+	for i := range v.NumField() {
 		fieldName := t.Field(i).Name
 		key := camelToKebab(fieldName)
 		typ := v.FieldByName(fieldName).Kind()
@@ -255,7 +255,7 @@ func (q Qualifiers) Map() map[string][]string {
 				continue
 			}
 			s := []string{}
-			for i := 0; i < value.Len(); i++ {
+			for i := range value.Len() {
 				if value.Index(i).IsZero() {
 					continue
 				}