refactor(browser): simplify credential storage config (#593)

utils/winutil/browser_meta_windows.go

@@ -35,9 +35,9 @@ const (
 
 // Entry is the per-browser Windows metadata record.
 //
-// Key must match browser.BrowserConfig.Storage so retrievers and path
-// resolvers share a single lookup identifier. CLSID/IID bytes are *not*
-// stored here; see the package doc for why.
+// Key must match browser.BrowserConfig.Key for every config that sets
+// WindowsABE: true, so retrievers and path resolvers share a single lookup
+// identifier. CLSID/IID bytes are *not* stored here; see the package doc for why.
 type Entry struct {
 	Key              string
 	ExeName          string

utils/winutil/browser_path_windows.go

@@ -29,7 +29,7 @@ var ErrExecutableNotFound = errors.New("browser executable not found")
 //     is not running and the registry is missing the entry).
 //
 // browserKey must match an Entry in Table; keys align with
-// browser.BrowserConfig.Storage.
+// browser.BrowserConfig.Key (for configs that set WindowsABE: true).
 func ExecutablePath(browserKey string) (string, error) {
 	entry, ok := Table[browserKey]
 	if !ok {