Autouse conftest fixture patches kanban_db.connect to refuse writes whose
resolved DB path lands under the REAL kanban root (captured at conftest
import time, before fixtures rewire the environment). Deny-list, not
allow-list, so hermetic tests moving HERMES_HOME to sibling tempdirs are
unaffected. Lazily attaches only when hermes_cli.kanban_db is already in
sys.modules.
Salvaged from PR #69385 by @smfworks; rebased by hand onto the pruned
conftest and adapted to guard on the resolved DB path (explicit db_path
or kanban_db_path()) rather than kanban_home() alone.
Co-authored-by: Jasmine Naderi <jasmine@smfworks.com>
