refactor: simplification

[rustatian]

Reason for This PR

Remove repeated memory lock callback setup.

Description of Changes

• Register each lock and create its cleanup callback in one place. Start the callback after registration in each acquisition path.

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 existing behavior while reducing duplicated setup and retaining focused test coverage.

Review effort: Balanced
Findings: None

What changed in this PR

Simplifies in-memory lock callback setup by centralizing lock registration in makeLockCallback.

Changes:

• Registers callback channels inside makeLockCallback.
• Updates acquisition paths and tests for the simplified API.

File	Description
locker.go	Centralizes lock registration and callback creation.
force_release_test.go	Verifies registration occurs before callback execution.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.80%. Comparing base (21dbe6a) to head (502fb9e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #106      +/-   ##
==========================================
+ Coverage   87.28%   87.80%   +0.52%     
==========================================
  Files           9        9              
  Lines        1007      968      -39     
==========================================
- Hits          879      850      -29     
+ Misses        128      118      -10     

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