Lightpanda installs no SIGSEGV handler, so a segfault (or the abort() in
the panic path) falls through to the kernel and writes a core dump. When
many instances run under a shared core_pattern crash reporter -- e.g. a
containerized crawl fleet -- those cores become pure storage/alert noise,
and a browser core can capture the contents of arbitrary pages.
Crashes are already reported via telemetry, so this adds an opt-in
LIGHTPANDA_DISABLE_CORE_DUMP env var (mirroring LIGHTPANDA_DISABLE_TELEMETRY)
that zeroes the soft RLIMIT_CORE at startup. Default behavior is unchanged.
