REDI-101: replace em/en dashes with hyphens in prose & comments

Em dashes are a common AI-writing tell; swap them (and en dashes) for plain
hyphens across the README and all KDoc/comment prose so the repo reads as
hand-authored. Byte-level replace of U+2014/U+2013 -> '-'; arrows and the
ellipsis are left untouched.

The two functional em dashes are intentionally kept: the `DASH = "—"`
blank-field UI placeholder in CharacterDetailUi and the preview sample that
mirrors it -- those are deliberate UX, not prose.

core/domain/src/main/kotlin/com/example/architecture/core/domain/Result.kt

@@ -13,7 +13,7 @@ sealed interface Result<out D, out E : Error> {
     ) : Result<Nothing, E>
 }
 
-/** A [Result] that carries no success payload — for operations that either succeed or fail. */
+/** A [Result] that carries no success payload - for operations that either succeed or fail. */
 typealias EmptyResult<E> = Result<Unit, E>
 
 inline fun <T, E : Error, R> Result<T, E>.map(map: (T) -> R): Result<R, E> {