jif 5371951292
Batch non-user history eviction to preserve Guardian transcript deltas ( #43798 ) ...
## Why
Evicting entries on every append once history fills invalidates Guardian's transcript cursor, forcing repeated full transcripts instead of deltas.
## What changed
On non-user history overflow, evict at least the oldest half of existing non-user entries, removing more if needed to meet the byte limit. This leaves room for subsequent appends without invalidating the cursor. Preserve the separate user-message retention limits.
## Testing
Update retention assertions and add a regression test that verifies a full transcript after eviction, followed by a delta on the same Guardian thread, while retaining the user's earlier restriction.
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5371951292