A run-time `sandbox.exec` span attached to a dead startup step. Two bridge
startup steps start long-lived work inside their measured step body: a poll
timer, socket handlers, and a callback-bridge worker loop. Node snapshots the
active-step store on each async resource at creation time, so this work kept
the ended step store. Each later run-time exec then read that store and opened
its span under the ended step, and it copied a wrong `criticalPath: false` flag.
Add an exported `runWithoutActiveStep` helper in startup-timing and wrap the
long-lived poll timer, the socket handlers, and the callback-bridge worker loop
of both bridge lanes. Each continuation now reads an empty store, so each
run-time exec opens an unparented span with no stale `criticalPath` flag.
Control flow is unchanged and the change adds no new dependency.
Co-authored-by: Paperclip <noreply@paperclip.ing>
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