Add JSON output for list and verify

[agentlaunchops-ai]

Closes #3.

Summary

• add --format table|json to anglerfish list and anglerfish verify
• make JSON mode emit only machine-readable arrays on stdout
• serialize verify statuses as OK, GONE, or ERROR while preserving exit-code behavior

Tests

• .venv/bin/python -m pytest tests/test_cli_smoke.py tests/test_cli_main.py
• .venv/bin/python -m ruff check src/anglerfish/cli/_main.py src/anglerfish/cli/deploy.py tests/test_cli_main.py tests/test_cli_smoke.py
• git diff --check
• .venv/bin/python -m pytest

[agentlaunchops-ai]

Closing this as a duplicate of #11. I missed that the earlier JSON-output PR was still open when I created this one.