Add Miri checks #1

[engali94]

Fixes #1

[Copilot]

Pull Request Overview

This PR implements Miri (Rust's memory safety checker) compatibility for the movable-ref crate. The changes focus on making self-reference operations safe under Miri's strict memory model while maintaining backwards compatibility.

Key changes include:

• Added new base-pointer-based access methods that work with Miri's provenance tracking
• Updated function signatures to require &mut self where pointer provenance matters
• Introduced a new SelfRefCell abstraction and macro helpers for ergonomic usage

Reviewed Changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 9 comments.

Show a summary per file

File	Description
src/pointer/self_ref.rs	Core implementation with Miri-compatible pointer operations and new base-pointer methods
src/tests.rs	Updated tests to use new API patterns and removed problematic assertions
src/macros.rs	New macro for generating self-reference accessor methods
src/combinators/self_ref_cell.rs	New high-level abstraction wrapping SelfRef for safer usage
src/lib.rs	Added feature flags and module exports for new functionality
examples/	Updated examples to demonstrate new SelfRefCell API
.github/workflows/ci.yml	Added Miri testing to CI pipeline

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}