docs: stop labelling current behaviour as legacy

Three of the five comments the audit found. always() accepts a predicate or a
formula and both are live: the shipped default properties pass a predicate, the
six example-spec properties pass a formula. String selectors are documented
first-class beside object selectors in spec-language.md. "all" is the
--platform flag's default value, not an older calling convention.

cmd/sanderling/doctor.go

@@ -24,8 +24,9 @@ type doctorCheck struct {
 }
 
 // doctorChecksFor returns the host-readiness checks for a target platform.
-// "all" returns the union (deduped by name) so the legacy zero-arg `doctor`
-// behaviour keeps surfacing every platform's prerequisites.
+// "all" returns the union (deduped by name), which is what `doctor` with no
+// platform does: it is the default, so it has to surface every platform's
+// prerequisites.
 func doctorChecksFor(platform string) []doctorCheck {
 	switch platform {
 	case "web":

internal/driver/chrome/translate.go

@@ -13,7 +13,7 @@ import (
 // `foo]:has(*),body[x="..."]` that would escape the intended match.
 var attrNamePattern = regexp.MustCompile(`^[a-zA-Z][a-zA-Z0-9_-]*$`)
 
-// TranslateStringSelector converts a legacy string selector ("id:foo",
+// TranslateStringSelector converts a string selector ("id:foo",
 // "descPrefix:bar") into a CSS selector or XPath expression usable from the
 // chrome driver's TapSelector fallback path. The boolean return is true when
 // the result is XPath rather than CSS. Unknown prefixes pass through to a CSS

internal/verifier/bindings.go

@@ -214,9 +214,10 @@ func (v *Verifier) checkNotExtracting(slot string) {
 	}
 }
 
-// bindAlways accepts either a predicate function (legacy shape) or a formula
-// handle (new shape). Both produce a formula handle tagged with
-// __sanderlingFormulaSpec.
+// bindAlways accepts either a predicate function or a formula handle, both
+// current: the shipped default properties pass a predicate, and every property
+// in the example specs passes a formula. Both produce a formula handle tagged
+// with __sanderlingFormulaSpec.
 func (v *Verifier) bindAlways(call goja.FunctionCall) goja.Value {
 	if len(call.Arguments) != 1 {
 		panic(v.runtime.NewTypeError("always requires exactly one argument"))