CAIN-INV-1230: Per-deployment HMAC keys for the Frontier 20 engines

VERIFIED source compiles

Domain	AGENT_IDENTITY_AND_CAPABILITY
Tier	ENGINEERING_INNOVATION
Source	`cain/cain_secret_material.py`
Mapped tests ran	8
Passed / failed / errored	8 / 0 / 0
Compiles	yes

Mapped tests

tests/test_frontier20_hmac_keys.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.