pub fn segv_trace_install()Expand description
Install the forge tier as the process-wide native tier. Idempotent — the first call wins; later calls return the already-installed tier.
Call once at binary startup (CLI, server). The live VM constructors in
logicaffeine-compile pick it up for every program they run.
LOGOS_NATIVE_TIER=0 skips installation entirely — the diagnostic
kill-switch that isolates pure-bytecode wall time from tiered runs.
Install the diagnostic SIGSEGV/SIGBUS tracer (no-op unless LOGOS_SEGV_TRAP
is set). Used to localize faults inside JIT’d code while root-causing.