ci: sync sample catalog from foundry-samples (template/dev)

[foundry-toolkit-sync-bot]

Summary

This automated draft PR updates samples/hosted-agent/sample-catalog.json by scanning
the microsoft-foundry/foundry-samples repository for hosted-agent sample templates.

What changed

• New templates added or removed based on the upstream repo structure.
• commitSha pinned to the upstream commit supplied via the commit_sha workflow input.
• requiresModel and protocol values re-derived from each sample's agent.yaml.
• displayName derived from each template's folder name; description LLM-generated when empty.
• PM-edited displayName and description values are preserved from the previous catalog.

Reviewer Checks

• Confirm new templates have correct language, framework, and protocol values.
• Review the auto-generated description for any new templates.
• Confirm no PM-edited display fields were accidentally lost.

[Yimin-Jin]

Closing as superseded during catalog cleanup. All six added templates (18-egress-control, 19-harness-research, 20-harness-data-processing, 21-harness-scaling-capabilities, activity/echo, and responses/uv-pyproject) are already present in the current dev snapshot. There are no other existing-template field changes to recover. No data from this obsolete snapshot is being published; future updates should be generated from the current workflow.