* fix(agents): extract abortable from runEmbeddedAttempt to release captured run scope on hung provider abort (#74182)
* test(agents): drop synthetic WeakRef retention test for abortable
* feat(scripts): add embedded-run-abort-leak harness for runtime closure-leak validation
* feat(scripts): add production mode to leak harness importing real abortable
* docs(changelog): add #74182 fix entry for embedded-run abort closure release
