Honor simulated memory resource alignment

[bdice]

Description

Updates simulated_memory_resource to validate requested alignment and align its simulated address cursor before returning allocations. This makes replay benchmark simulated allocations preserve alignment semantics.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[coderabbitai]

📝 Walkthrough

Walkthrough

The simulated_memory_resource::allocate(...) method now properly enforces memory alignment. It validates the alignment parameter as a non-zero power of two, aligns the allocation start address before allocating, performs bounds checking using the aligned address, and advances the internal pointer based on the aligned allocation size.

Changes

Alignment Handling in Memory Resource Allocation

Layer / File(s)	Summary
Alignment enforcement in allocate(...) cpp/benchmarks/utilities/simulated_memory_resource.hpp	Added <cstdint> header; refactored allocate(...) to validate alignment is a non-zero power of two, compute aligned start addresses from the current begin_ pointer, perform bounds checking against the aligned region, and update begin_ based on the aligned allocation size rather than the unaligned pointer.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested reviewers

• lamarrr
• harrism

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title directly and specifically describes the main change: updating simulated_memory_resource to honor alignment requests in its allocate implementation.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description check	✅ Passed	The pull request description clearly describes the purpose and scope of the changes: honoring alignment in the simulated memory resource to preserve alignment semantics in replay benchmarks.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[bdice]

/merge