ci(server): publish agent-control-server to PyPI

[abhinav-galileo]

Summary

The release workflow stages `server/dist/` and uploads it to GitHub release assets, but does not currently push the server wheel to PyPI. Models, evaluators, and the SDK are published; the server is not.

This change adds a `publish-server` job between `publish-evaluators` and `publish-sdk`, matching the pattern of the other publish jobs.

Scope

• User-facing/API changes: `agent-control-server` becomes installable via `pip install agent-control-server` after the next release.
• Internal changes: dependency chain in the workflow updated to evaluators -> server -> sdk (server depends on evaluators at runtime, so evaluators publishes first).
• Out of scope: anything outside the release workflow.

Risk and Rollout

• Risk level: low. New workflow job; failure to publish server doesn't affect previously published packages because `pypa/gh-action-pypi-publish` is per-job atomic.
• Rollback plan: revert the workflow file.

Testing

• Validated YAML structure locally.
• Verified by the next `workflow_dispatch` release run.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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