- runPrintMode dereferenced session.sessionManager before checking whether
plan.defaultOnStartup was even enabled, crashing partial-session harnesses;
the settings check now short-circuits first.
- Extended the print-mode session fakes with the settings/sessionManager
members every real session provides.
- Scoped the rpc-stdin-lock stderr assertion to non-load-notice lines: the
adversarial fixture's load failure is now legitimately surfaced (#4954)
and mentions the locked stream by design.
Claimed Bun's singleton stdin reader before loading extensions and passed the owned stream into RPC and RPC-UI mode.
Added process-level regressions for both modes with a startup extension that attempts to lock stdin.
Fixes#5898
can1357