* fix(memory-core): keep live reindex of reset/deleted session archives
The session transcript listener dropped every archive artifact before
scheduling, so .jsonl.reset and .jsonl.deleted archives written by /reset
and session delete were no longer indexed on the live path and only
surfaced in memory search after the next gateway restart. Remove the
archive guard so in-agent archives fall through to scheduleSessionDirty,
which reaches the usage-counted-archive branch in processSessionDeltaBatch.
Regression from #89912; restores the incremental archive indexing added in
* fix(memory-core): constrain live archive indexing
* test(memory-core): align migrated search fixtures
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Co-authored-by: Peter Steinberger <steipete@gmail.com>
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