* fix(memory): retain worker session export retries
Reject after two obsolete redaction snapshots instead of exporting on the
Gateway thread. Record resolved targeted sessions before preparation so a
failed export retains pending work for generic retry. Full rebuilds continue
to preserve the published index.
Verified both regressions against independent controls and all four ordinary
redaction cases against the final code.
* test(memory): isolate queued retry recovery from dirty state
Use the existing maintenance handoff so ordinary dirty-file retries cannot rescue a dropped queued request. Preserve every queue recovery assertion.
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