Adds `pid` and `uptime` fields to the /health response so external monitors
(and the local E2E watchdog) can detect a silent process restart between
two checks — e.g. an unhandled rejection that crashes Node and Docker
quietly relaunches the container.
Also adds .gitignore patterns for a local-only E2E suite that lives in
tests/e2e/local/ on individual machines and is never pushed.
Paul Nothaft
8d0fb8e157