docs: restore loop cycle error guidance

[puneetdixit200]

Summary

• restore the missing Loops & Cycle Errors section in docs/deploy-process.rst
• add a stable #loops-cycle-errors anchor for the link referenced by the cycle error message
• document using host.loop to disambiguate operation ordering inside loops

Fixes #1494.

Validation

• git diff --check -- docs/deploy-process.rst
• DOCS_VERSION=latest uv run --python 3.14 --group docs sphinx-build -b html docs build/docs
• rg -n "loops-cycle-errors|Loops & Cycle Errors" build/docs/deploy-process.html docs/deploy-process.rst
• uv run --python 3.14 pytest tests/test_cli/test_cli_deploy.py::TestCliDeployState::test_deploy -q

AI assistance disclosure

This contribution was prepared with assistance from OpenAI Codex. I reviewed the AI policy, issue context, existing host.loop implementation, generated documentation output, and validation results before submitting.

[Fizzadar]

LGTM, thanks for putting this back @puneetdixit200!