♻️ Keep the public API to the four factories

The builder types are already the inferred return types and travel into
the emitted .d.ts, so exporting them only made them nameable while
pinning the internal Strict/Widening split as API. Revert the type
exports and the public renames, drop the type-surface test, and document
only the factories in README and development/library.md.

src/index.ts

@@ -1,8 +1,8 @@
 /**
  * The public entry point of `tiny-pattern-ts`.
  *
- * Exports the four matcher factories and the builder types they return.
- * Everything else in `src/` is an implementation detail.
+ * Exports the four matcher factories and nothing else; the builder types they
+ * return and the rest of `src/` are implementation detail.
  *
  * @module
  */
@@ -10,17 +10,7 @@ export {
     getPrimitiveUnionMatcher,
     getPrimitiveUnionMatcherW,
 } from "./primitive-union.ts";
-export type {
-    PrimitiveUnionMatcher,
-    PrimitiveUnionMatcherW,
-} from "./primitive-union.ts";
 export {
     getTaggedUnionMatcher,
     getTaggedUnionMatcherW,
 } from "./tagged-union.ts";
-export type {
-    TaggedUnionMatcher,
-    TaggedUnionMatcherFactory,
-    TaggedUnionMatcherW,
-    TaggedUnionMatcherWFactory,
-} from "./tagged-union.ts";