Companion I-D to draft-nennemann-wimse-execution-context defining
ECT semantics mapped to CBOR encoding, COSE_Sign1 signing, and CWT
claims for constrained devices and non-HTTP transports (CoAP, MQTT,
raw binary). Aligned with JWT draft changes: jti/cti as unified
token+task ID (no separate tid), pol/pol_decision optional but paired.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
