Use wrapPick with dynamic imports; make wrapPick synchronous

[winton]

Summary

• wrapPick is now synchronous — it composes wrap(pick(...)) directly and returns an immediately callable wrapped function instead of a Promise<WrappedFunction>. No await needed at the call site.
• The src/example/controlFlow.ts example is updated to use a single import() variable with wrapPick for each function — no static imports, no wrap calls.
• README updated throughout: the "Why typectl?", "Core concepts", and all relevant API sections now showcase promise-chaining without await, with wrapPick elevated as a key primitive alongside wrap.

Test plan

• npm test passes (38 tests)
• wrapPick no longer requires await at the call site
• Dynamic import pattern works end-to-end in src/example/spec.ts

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