fix: display Workbench providers and bump fast-agent starter to 0.10.24

[evalstate]

Summary

• Show the explicitly recorded provider for Workbench runs in Runs and Run detail; label its provenance as submission metadata rather than verified routing.
• Preserve native per-agent configuration, non-Workbench display behavior, and unspecified values when no provider was recorded.
• Bump both fast-agent Workbench starter definitions to fast-agent-mcp==0.10.24, with matching tests and documentation. Saved/custom recipes and existing runs are unchanged.

Validation

• Clean main-based checkout: build, formatting, lint, type checks, generated contracts, dependency audit, and 1,466 unit tests passed.
• Provider identity helper has 100% targeted coverage.
• All 74 browser tests passed in the clean checkout on a dedicated port, including the list/detail provider regression without routing changes.
• Public privacy scan passed.

Ownership and release

• Harbor native AgentConfig.model_name checked at pinned revision dcd0a7ac74b7bd417780d9cb27cd819c7ec82e4e in src/harbor/models/trial/config.py.
• Existing Workbench compiler and immutable submission.model.provider supply the recorded label. No schema, persistence, routing, inference, or worker change.
• Reuse the existing verified worker image digests. Deployment remains subject to execution-safety checks; no benchmark launch/control action is included.