id_effect 3.0.0

Effect<A, E, R> (sync + async), capability DI, pipe — interpreter-style, no bundled executor
Documentation 
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# Chapter title — what the reader can do afterward

<!-- One paragraph: real-world problem + where this fits in the book. No crate dump. -->

## What you'll learn

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## Prerequisites

- [Prior chapter](./path.md) — one-line why

## Putting it together

<!-- Runnable or near-runnable example; continue the book's running example when possible. -->

## Summary

<!-- 3–5 sentences: mental model shift, not API inventory. -->

## Next steps

- [Next chapter](./path.md) — one-line teaser