Requests accumulate history, so the mock re-counted the start receipt on
every follow-up request (observed 2 == 1). Dedupe seen receipts and pin the
new contract: the owned notify_on_complete completion resumes in-process as
one follow-up user turn carrying the child's output and exit code.
Capture the durable parent session before output readers start, including CLI
and non-notifying spawns. Require that parent or its compression continuation
for retained reads; exact and prefix handles alone do not authorize access.
Live Linux terminal/one-shot linger/fresh-reader A/B: base loses results;
updated owner recovers both streams and exit 7. Unbound, foreign session,
delegated child, and other profile cannot recover the receipt. No notifications
are replayed. Full tools suite is queued behind the campaign test lock.
Follow-up to contributor salvage #104805 for #104511.
kshitijk4poor