✨ Compile doc code fences into tests

Every `ts`-tagged fence in README.md / CONTRIBUTING.md now becomes an
executed `node:test` case in a gitignored generated file, so a
documented example cannot drift from the API. The generator hoists and
merges the leading imports, rewrites the library specifier to the
`#test-tiny-pattern-ts` alias, and rejects a fence with no describing
paragraph or one that re-imports a prelude module.

CI regenerates via `pretest:ci`; `create:doc-tests` runs the generator,
formats, then typechecks the output against a scoped tsconfig that
relaxes `noUnusedLocals`. c8's default excludes already omit the
generated `*.test.ts`, so `test:ci` is unchanged.

development/workflow.md

@@ -96,7 +96,8 @@ aggregator.
 
 #### Why
 
-- Both members create something real: a branch, a release.
+- Every member creates something real: a branch, a release, the compiled
+  doc-tests.
 - It joined both lists in [CONTRIBUTING.md](../CONTRIBUTING.md) alongside its
   first members, so it could not go invisible the way the retired `use:` prefix
   did.