# Context Integrity Review

**SKU:** CAIN-A75-015  
**Development:** #15 Retained reasoning and context compaction  
**Product status:** DELIVERABLE  
**Engine:** `context_compaction` (`cain_a75_engines/contextcompaction/engine.py`)  
**Profile:** `retained_reasoning`  
**Generated:** 2026-11-12T07:59:12Z UTC

## Result

VERIFIED: compression ratio, verbatim retention and invented items recomputed; 17/17 compaction-failure cases as expected

- **retained_reasoning_compaction**: VERIFIED
- **honest_compaction**: PRESERVED
- **critical_item_dropped**: LOST
- **critical_item_in_dropped_list**: LOST
- **retained_quote_altered**: LOST
- **invented_retained_item**: LOST
- **summary_not_smaller**: LOST
- **ratio_too_weak**: LOST
- **item_hash_mismatch**: LOST
- **context_hash_mismatch**: LOST
- **duplicate_retained**: LOST
- **unknown_retained_id**: LOST
- **duplicate_item**: LOST
- **bad_kind**: LOST
- **claim_overstates**: LOST
- **unknown_claim**: LOST
- **wrong_schema**: LOST
- **garbage**: LOST

## Limits of this run

Checks the compaction record, not summary quality. It does not prove the must-retain list was complete or that the next decision uses the context correctly. The run is Ed25519-signed; pin the issuer key out of band.

This is a bounded run on a sample. It is not an assessment of any production system, not a
certification, and not a signed attestation. The accompanying `manifest.json` records SHA-256
hashes so a recipient can detect a changed file. The manifest is not a signature and not an
attestation; it does not prove who produced the artifact.

## What this is not

- Not a vendor integration, partnership or endorsement.
- Not legal, tax, clinical, insurance or safety advice.
- Not a third-party audit, SOC 2 report, ISO certification or patent filing.
- Not a production write action: no downstream tool was called.

Prices and packaging are proposals. Built by a three-person team.