User flagged a leftover "Notify E2E" workspace on the canvas — caused by
an earlier debug run getting SIGPIPE'd before the EXIT trap could fire.
Add an idempotent pre-sweep at the top of the script so the next run
cleans up any prior leftover with the same name. Belt-and-suspenders
with the existing trap; both have to fail for a leak to persist.
Verified:
- Normal run: 14/14 pass, 0 leftovers
- SIGTERM mid-setup: trap fires, 0 leftovers
- Re-run after interruption: pre-sweep + new run both clean
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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