add make lint and make test

[kerthcet]

What this PR does / why we need it

Which issue(s) this PR fixes

Fixes #

Special notes for your reviewer

Does this PR introduce a user-facing change?

[Copilot]

Pull request overview

This PR adds repository-level lint/test automation and introduces Python unit tests for the SandD server API.

Changes:

• Adds make lint and expands make test to run Rust and Python tests.
• Adds a new GitHub Actions workflow for lint/test CI.
• Adds Python server tests and minor formatting/lint cleanups.

Reviewed changes

Copilot reviewed 8 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Makefile	Adds Ruff linting and expands test commands across Rust and Python.
.github/workflows/rust-ci.yaml	Adds CI jobs that call the new Make targets.
python/tests/test_server.py	Adds unit tests for the Python Server wrapper.
python/tests/__init__.py	Marks the Python tests package.
server/src/server.rs	Removes unused imports.
server/src/protocol.rs	Removes an unused import.
sandd/src/main.rs	Applies formatting/lint cleanups.
examples/agent_example.py	Removes an unnecessary f-string.
.github/workflows/kube-workflow-init.yaml	Whitespace-only formatting update.

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[kerthcet]

/lgtm
/kind cleanup

[kerthcet]

/triage accepted