Issue #74874. The renderer's 'Repair' button treated every transient
backend GIL stall (event loop stalled ... ws ready frame send failed)
as a fatal backend fault, asking the bootstrap to force-reinstall +
restart, which then stalled again for the same reason — looping the
user through 30+ minutes of reinstall cycles.
Distinguish 'venv is genuinely broken' from 'backend is just transiently
stalled' before honouring a repair request. Probe the live backend
process (exitCode === null && signalCode === null) and an in-flight
repair-attempt counter:
attempt <= 3 AND primary alive → soft restart (skip installer)
attempt <= 3 AND primary dead → soft restart (verify before reinstall)
attempt > 3 → hard reinstall (escalate)
Counter resets on a clean backend.ready so a later, unrelated failure
episode starts at attempt 1. The guard is a pure helper (decideBootstrap
Repair in electron/bootstrap-repair-guard.ts) so the decision logic is
unit-tested in isolation; main.ts only wires the existing flag and
counters to it.
Refs #74874
Kewe63
16e66e721f