Feature/cicd

[Samanyu-dev]

This PR adds the --diff-only argument to the CI export capabilities, which filters the exported heap blocks to include only those that are new or changed relative to the baseline snapshot taken at startup. This ensures that massive JSON/CSV files don't become bogged down with identical unmodified blocks.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Chore / Refactor

Related issues

• Issue: Add --diff-only export mode to filter unchanged blocks #74

How Has This Been Tested

• Unit tests: cargo test --lib
• Integration tests: cargo test --test integration_tests
• Manual steps:
  • Executed mvis ci to verify the --diff-only validation rejects executions missing --leak-check.
  • Exported a differential heap JSON and observed significantly smaller payload sizes.
• Platform tested on: macOS

Checklist

• I have read the CONTRIBUTING.md and followed the repo guidelines.
• Code builds locally (cargo build --release)
• All tests pass (cargo test)
• New and existing tests cover my changes
• I added/updated documentation where applicable
• I updated CHANGELOG or release notes if needed

CI and Performance Notes

• Performance impact: Significantly reduces file I/O operations and final artifact sizes when creating heap snapshots of large processes by filtering unmodified baseline entries prior to serialization.

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[SickleFire]

LGTM! consistent formatting and styling like with the other flags.