Harden Guardian reviews after context compaction - #42852
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## Why Guardian reviews must not lose user authorization constraints or reuse an unreadable or incompatible parent checkpoint after compaction. ## What changed - Retain bounded excerpts of oversized root user messages across compaction, resume, and rollback, and recover excerpts from legacy Guardian history when available. - Require thread-owned Guardian review sessions and asynchronous scoring to reuse only non-empty checkpoints produced by a compatible review model. - Fail closed instead of reviewing without the required checkpoint when reuse is disabled, compatibility is unknown, or checkpoint content is unusable. ## Testing Expanded retained-context, review-session, asynchronous-scoring, and app-server coverage for oversized instructions, legacy recovery, model incompatibility, missing content, resume, rollback, and disabled checkpoint reuse. GitOrigin-RevId: f30d837197e0d838e656a632109f490c38208f5e
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Harden Guardian reviews after context compaction
Why
Guardian reviews must not lose user authorization constraints or reuse an
unreadable or incompatible parent checkpoint after compaction.
What changed
resume, and rollback, and recover excerpts from legacy Guardian history when
available.
reuse only non-empty checkpoints produced by a compatible review model.
is disabled, compatibility is unknown, or checkpoint content is unusable.
Testing
Expanded retained-context, review-session, asynchronous-scoring, and app-server
coverage for oversized instructions, legacy recovery, model incompatibility,
missing content, resume, rollback, and disabled checkpoint reuse.