polyc-crypto 2026.9.0

Provenance signatures (commonware-cryptography ed25519) for polychrome tool calls.
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Provenance signatures for polychrome.

Wraps commonware-cryptography ed25519 so the harness can sign the bytes that back a tool call's signature field and the control plane can verify them. A fixed [NAMESPACE] provides cross-domain separation (a signature minted here cannot be replayed in another context).

This primitive is runtime-agnostic — it does not pull in commonware-runtime or commonware-p2p.