Two checkouts cannot run run_e2e.sh at the same time: it hardcodes 4000/5432/
8090, so the second aborts on "port 4000 is in use" and the only way forward is
to stop someone else's stack.
PROXY_PORT / POSTGRES_PORT / MOCK_LLM_PORT now override those, defaulting to the
historical values so an unset environment behaves exactly as before -- CI, the
CircleCI job and the chart's sidecar all keep working untouched.
Two details that would otherwise make a relocated stack fail confusingly:
- the suite resolves its target from E2E_UI_BASE_URL, which defaults to :4000
independently, so the run would build and boot correctly and then test
whatever was on the default port. run_e2e.sh now derives it.
- the mock server binds its port in server.py, so moving it needs MOCK_LLM_PORT
there too. Its HOST stays loopback-only: 127.0.0.1:8090 from inside the
proxy's own pod is the contract the e2e chart's sidecar is written against.
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