ci(rust): stabilize cross-platform CLI matrix by removing unnecessary…

[Anandb71]

… ubuntu GUI deps and using --locked

Description

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Fixes #(issue number)

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation update
• Performance improvement
• Code refactoring

Changes Made

• List the key changes made in this PR
• Be specific about files/modules affected

Testing

Describe how you tested your changes:

• Ran cargo test --all
• Ran cargo clippy --all
• Ran flutter test (if applicable)
• Tested manually with a real codebase

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Checklist

• My code follows the project's style guidelines
• I have added tests for my changes
• I have updated the documentation where necessary
• All new and existing tests pass
• I have added appropriate comments where the code isn't self-explanatory

[github-actions]

🧠 Arbor Graph Impact Report

Blast Radius: High-centrality nodes affected?

🧠 Arbor Graph Impact Report

Unable to generate impact report.

Command: analyze-impact --pr=123

stderr:
```
error: unrecognized subcommand 'analyze-impact'

Usage: arbor [OPTIONS]

For more information, try '--help'.
```

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[Copilot]

Pull request overview

This PR adjusts the Rust CI workflow to make the cross-platform CLI build more deterministic and less dependent on Ubuntu-specific system packages.

Changes:

• Removed the Ubuntu-only apt-installed GUI/system dependency step from the cross-platform CLI matrix job.
• Added --locked to the cross-platform release CLI build to ensure Cargo.lock is honored in CI.