counter-sign 0.1.0

First public draft of counter-sign — an open protocol for agent-to-human authorization.

• Spec v0.1 (four nouns: Intent, Route, Countersignature, Default) with M-of-N quorum
• TypeScript reference implementation: core + 5 adapters + wrapAction shim, 74 tests (89 as of v0.1.1)
• Security-hardened: authority binding, domain separation, quorum fail-safe (see docs/security-review.md)
• Compliance mapping (SOC 2 / ISO 27001 / NIST AI RMF / EU AI Act Art. 14)

See CHANGELOG.md for details. Code: Apache-2.0 · Spec text: CC BY 4.0.