Add JSON output for list and verify

[agentlaunchops-ai]

Summary

• add --format json to the list and verify subcommands
• keep JSON output machine-readable by suppressing Rich banner/table/auth progress output in JSON mode
• add CLI smoke coverage for JSON parsing and unchanged verify exit behavior

Closes #3.

Tests

• uv run --extra dev pytest tests/test_cli_smoke.py -q
• uv run --extra dev ruff check .
• uv run --extra dev pytest