The routed no_agent child env started from all of os.environ and only overwrote the
names present in the installed scope. A name defined only by the LAUNCH profile's .env
and absent from the routed profile therefore reached the routed child with the launch
value instead of unset -- the secret scrub only knows classified names, so a custom or
unclassified secret crossed the profile boundary (review finding on the first head).
strip_launch_profile_env (main, 284d220ba4) is the primitive the external-worker path
already uses for exactly this: it drops the launch profile's dotenv-owned keys and the
bridged TERMINAL_* settings, and is a no-op outside multiplex or when the target IS the
launch profile. Apply it to the base BEFORE the scope overlay (so a shared name keeps its
routed value) and BEFORE the sanitizer (so routed values still pass the scrub and
passthrough rules). Pinned by a child-process negative control: the launch-only name
arrives <unset>, the shared name arrives routed, and the parent process is unchanged.
(cherry picked from commit 69349b527b5144c1f1540a4c10035d5ec798c1db)
John Paul Soliva
023e4f997f