F1: with system.proxy set, the first launcher check no longer returns
before the account, sandbox, capacity and limit checks. It skips only the
harness preflight and the session proxy key match, which need the key P2
admits in startLocked. A launch that can never start now refuses before
authorizeLaunch, the workspace and checkouts, and modelPreflight. The first
proxy pass accepts only credential "proxy" for a declared account, tries
the fallback model when the primary refuses, and lets mayLaunch
key-quota-no-model-key through so P2 can issue the first key. The final
check is unchanged and still runs before newRun and spawn.
F4: the proxy test option is renamed testProxy and createLauncher throws
test-proxy-refused when it is given with system.proxy.
launch-account.test.mjs is a second caller, so the option stays.
Tests: proxy-launch-order.test.mjs (6), launcher.test.mjs F4 throw test;
the managed launch fixture gains bwrap, admit and trace.ops.
jason.woltje
85ecdfbde5