co-primitives 0.1.0

COKIT Primitives used throughout the `co-sdk` and `co-api` and Core implementations.
Documentation 
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// SPDX-License-Identifier: AGPL-3.0-only
// Copyright (C) 2026 1io BRANDGUARDIAN GmbH

use crate::Clock;
use cid::Cid;
use serde::{Deserialize, Serialize};
use std::collections::BTreeSet;

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct Entry {
	/// The stream id.
	/// Todo: Do we need this?
	#[serde(rename = "i", with = "serde_bytes")]
	pub id: Vec<u8>,
	#[serde(rename = "p")]
	pub payload: Cid,
	#[serde(rename = "n")]
	pub next: BTreeSet<Cid>,
	#[serde(rename = "r", default, skip_serializing_if = "BTreeSet::is_empty")]
	pub refs: BTreeSet<Cid>,
	#[serde(rename = "c")]
	pub clock: Clock,
}

#[derive(Debug, Clone, Serialize, Deserialize, PartialEq)]
pub struct SignedEntry {
	/// The identity.
	#[serde(rename = "u")]
	pub identity: String,

	/// Identity public key.
	#[serde(rename = "k", default, with = "serde_bytes", skip_serializing_if = "Option::is_none")]
	pub public_key: Option<Vec<u8>>,

	/// The identity.
	#[serde(rename = "s", with = "serde_bytes")]
	pub signature: Vec<u8>,

	/// Entry.
	#[serde(rename = "e")]
	// note: this causes serde to write unbounded maps which are indefinite length maps which are not supported in
	// DAG-CBOR. #[serde(flatten)]
	pub entry: Entry,
}