fix(cloud): add CLAUDE_MODEL to agent-cleanup.yml environment teardown

[gHashTag]

Task

The agent-cleanup workflow (.github/workflows/agent-cleanup.yml) should log the model used when cleaning up.

Acceptance Criteria

• Add CLAUDE_MODEL to the env vars logged during cleanup
• Print which model the agent used in the cleanup comment
• Single file edit, ~5 lines

Files to edit

• .github/workflows/agent-cleanup.yml

Implementation hint

In the cleanup step, add:

echo "Agent used model: ${CLAUDE_MODEL:-unknown}"

[gHashTag]

🚀 Agent spawned on Agents Anywhere service with glm-5 model. Tracking in this issue.

[gHashTag]

Agent failed silently — root cause: stale GH_TOKEN on Agents Anywhere. Fixed: GH_TOKEN deleted, workflow updated to set GH_TOKEN explicitly.