[#1331] make cleanupstate zerocopysend

[elfenpiff]

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References

Closes #1331

[Copilot]

Pull request overview

This PR makes CleanupState zero-copy sendable by implementing the ZeroCopySend trait, as required for zero-copy inter-process communication. The changes involve type modifications and field reordering to ensure proper memory layout and platform-independent representation.

Changes:

• Modified CleanupState to implement ZeroCopySend by adding #[repr(C)] and changing field types from usize to u64
• Reordered fields in Channel, SafelyOverflowingIndexQueue, and IndexQueue structures for optimized memory layout
• Updated changelog to reflect the implementation of ZeroCopySend for CleanupState

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
iceoryx2/src/node/mod.rs	Added ZeroCopySend derive and #[repr(C)] to CleanupState, changed field types from usize to u64
iceoryx2-cal/src/zero_copy_connection/common.rs	Reordered fields in Channel struct, moving state field before queues
iceoryx2-bb/lock-free/src/spsc/safely_overflowing_index_queue.rs	Reordered fields in SafelyOverflowingIndexQueue for improved alignment
iceoryx2-bb/lock-free/src/spsc/index_queue.rs	Reordered fields in IndexQueue for improved alignment
doc/release-notes/iceoryx2-unreleased.md	Added changelog entry noting CleanupState implements ZeroCopySend

Comments suppressed due to low confidence (1)

doc/release-notes/iceoryx2-unreleased.md:53

• The changelog entry should be moved from the "Refactoring" section to the "API Breaking Changes" section, as the type change from usize to u64 in CleanupState fields is a breaking API change. This affects: (1) Rust code that constructs CleanupState with struct literals, (2) Python FFI bindings that expose these fields as usize, and (3) any code that pattern matches on CleanupState. Additionally, the changelog should mention the binary layout changes in internal data structures (Channel, IndexQueue, SafelyOverflowingIndexQueue) which break compatibility with existing shared memory segments.

  [#1300](https://github.com/eclipse-iceoryx/iceoryx2/issues/1300)
* Replace `lazy_static` dependency with `LazyLock` from `std` in `std` builds or

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 77.92%. Comparing base (8dc88e2) to head (dd6d304).
⚠️ Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1332      +/-   ##
==========================================
- Coverage   77.95%   77.92%   -0.04%     
==========================================
  Files         406      406              
  Lines       38941    38941              
  Branches     1256     1256              
==========================================
- Hits        30356    30343      -13     
- Misses       7552     7565      +13     
  Partials     1033     1033              

Flag	Coverage Δ
CPP	68.04% <ø> (ø)
Rust	77.77% <ø> (-0.04%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
iceoryx2-bb/lock-free/src/spsc/index_queue.rs	85.16% <ø> (ø)
...ck-free/src/spsc/safely_overflowing_index_queue.rs	94.58% <ø> (ø)
iceoryx2-cal/src/zero_copy_connection/common.rs	91.42% <ø> (-0.74%)	⬇️
iceoryx2/src/node/mod.rs	64.30% <ø> (ø)

... and 11 files with indirect coverage changes

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