CAIN-INV-1617: Shared input hardening for the Frontier-20 engines (2026-10-04 truth pass)

VERIFIED source compiles

Domain	EXECUTION_CONFINEMENT
Tier	IMPLEMENTATION
Source	`cain/cain_frontier_hardening.py`
Mapped tests ran	81
Passed / failed / errored	81 / 0 / 0
Compiles	yes

Mapped tests

tests/test_frontier20_truth_pass.py

Generated 2026-10-06T19:15:35Z from git unknown. This page is a republication of the run result; it is not an independent audit.

Same-project verification only. The tests are authored in this repository; no third party has reviewed or reproduced these results. VERIFIED means the mapped tests passed in this run, not that the mechanism is independently correct.