delete_profile stopped only the process named in gateway.pid, but a Desktop
app spawns a headless `serve`/`dashboard` backend per profile that holds the
profile's SQLite connection open and keeps writing sessions/WAL/sandbox files.
That backend is never in gateway.pid, so a CLI `hermes profile delete` run
while the Desktop app is up left it writing into the tree — rmtree's final
rmdir then failed with ENOTEMPTY (#47368 "Bug 2"), and pre-guard it also
resurrected the directory.
- _profile_bound_backend_pids(): find running Hermes backends bound to this
profile via a `--profile <name>` selector or a HERMES_HOME env resolving to
the profile dir. Tightly scoped — current-user only, backend subcommands
(serve/dashboard/gateway) only so an interactive chat is never killed, and
never this process or its ancestors.
- _stop_profile_backends(): terminate them (graceful, then force), best-effort
so it can never make delete worse.
- _rmtree_with_retry(): a few spaced retries absorb the ENOTEMPTY / Windows
file-lock race from a just-terminated writer's in-flight -wal/-shm/sandbox
writes instead of failing the whole delete on a race the next attempt wins.
Complements the recreation guard (deleted profiles no longer reappear) and the
Desktop teardown-before-delete flow; this is the CLI-side convergence fix for a
delete run while a Desktop-managed backend is live.
Part of #47368.
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