CAIN-INV-1602: Small crypto helpers for the messenger core: Ed25519 signing over canonical JSON, and HMAC tags

VERIFIED source compiles

Domain	GOVERNANCE_RUNTIME
Tier	IMPLEMENTATION
Source	`clawx/messenger/crypto.py`
Mapped tests ran	119
Passed / failed / errored	119 / 0 / 0
Compiles	yes

Mapped tests

platform-gateway/tests/test_cain28_evidence_bundle_and_verifier.py

scripts/cain42_proof/test_manifest.py

tests/clawx_control_plane/test_control_plane.py

tests/clawx_control_plane/test_epistemic.py

tests/clawx_control_plane/test_epoch14_bundle.py

tests/clawx_control_plane/test_epoch_bundle.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.