refactor: simplification

[rustatian]

Reason for This PR

Remove duplicate key deletion code from the memory store.

Description of Changes

• Reuse the existing locked delete method, including TTL callback cancellation. Remove the duplicate method with unused return values.

License Acceptance

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.

PR Checklist

• All commits in this PR are signed (git commit -s).
• The reason for this PR is clearly provided (issue no. or explanation).
• The description of changes is clear and encompassing.
• Any required documentation changes (code and docs) are included in this PR.
• Any user-facing changes are mentioned in CHANGELOG.md.
• All added/changed functionality is tested.

[Copilot]

Copilot review overview

🟢 Approval recommended

The refactor preserves deletion and TTL-cancellation behavior without leaving stale references.

Review effort: Balanced
Findings: None

What changed in this PR

Simplifies memory-store deletion by reusing the existing callback-aware delete method.

Changes:

• Routes driver deletions through hmap.Delete.
• Removes the redundant LoadAndDelete implementation.

File	Description
memorykv/​map.go	Removes duplicate deletion logic.
memorykv/​driver.go	Uses the shared locked delete method.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.89%. Comparing base (c47ede8) to head (87be3f0).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #249      +/-   ##
==========================================
- Coverage   81.09%   80.89%   -0.21%     
==========================================
  Files           6        6              
  Lines         455      445      -10     
==========================================
- Hits          369      360       -9     
+ Misses         86       85       -1     

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