handleRpc answers both methods itself before it reaches its proxy branch, so
the two list entries were never used and the list named two methods that are
never sent to the RPC endpoint. No other entry is answered earlier.
PROXY_METHODS is now exported from the background script so that
tests/proxyMethods.test.js can send every listed method from a page and fail
on any that does not reach the RPC endpoint.
Model: opus-5-5
