Add sandbox provider selection

[tthuwng]

Summary

Adds sandbox provider selection to Valkyrie for vals-ai/valkyrie-ticket-library#21.

• Adds --sandbox-provider to the run CLI with daytona as the default.
• Sends x-sandbox-provider to benchmark services.
• Uses the shared CBS sandbox provider interface for sandbox creation, command execution, uploads, cleanup, and force-stop.
• Preserves Daytona behavior by only sending Daytona credentials for Daytona runs.

Stack

Depends on vals-ai/create-benchmark-service#29.

Validation

• .venv/bin/ruff check src/valkyrie/cli/main.py src/valkyrie/cli/tracker_service.py services/tracker/src/tracker/sandbox.py services/tracker/src/tracker/utils.py services/tracker/src/tracker/types.py services/tracker/src/tracker/database/models.py services/tracker/tests/unit/test_sandbox.py
• .venv/bin/basedpyright src/valkyrie/cli/main.py src/valkyrie/cli/tracker_service.py services/tracker/src/tracker/sandbox.py services/tracker/src/tracker/utils.py services/tracker/src/tracker/types.py services/tracker/src/tracker/database/models.py services/tracker/tests/unit/test_sandbox.py
• .venv/bin/python -m pytest services/tracker/tests/unit -q

Notes

The dependency lock points at the CBS feature branch and should be moved back to the merged CBS commit/main once that PR lands.

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