feat(web): add account workspaces and signed content flows

packages/core/src/index.ts

@@ -13,6 +13,7 @@
  */
 
 export { ChannelSession, openLink } from './session.js';
+export { parseEnvelope } from './frame.js';
 export type {
   AuthRole,
   ChannelSettings,
@@ -40,6 +41,8 @@ export { buildLink, parseLink } from './link.js';
 export type { LinkParts, ParsedLink } from './link.js';
 
 export { fromBase64Url, toBase64Url } from './bytes.js';
+export { contentEventPayload, frameManifestHash, generateSigningKeyPair, importSigningPublicKey, signStatement, verifyStatement } from './signatures.js';
+export type { ContentEventStatement } from './signatures.js';
 
 export { Flags, MAX_FRAME_DATA, PROTOCOL_VERSION } from './constants.js';
 export type { ChannelMode, ItemKind } from './constants.js';