v0.71.0

Removed

• The ./identity subpath. The WAS identity derivation (agentsFromSecret /
  agentsFromSeed / agentsFromKeyAgent, ProfileAgents, singleKeyResolver,
  zcapClientForSigner, the BOOTSTRAP_HANDLE / BOOTSTRAP_KEY_NAME handles)
  moved byte-for-byte to @interop/was-client/identity 0.55.0, with
  zcapClientForSigner also at was-client's root entry. Consumers repoint their
  imports from @interop/wallet-core/identity to
  @interop/was-client/identity.

Changed

• @interop/was-client dependency bumped to ^0.55.0.
• The identity fixture test (test/node/identity.test.ts, pinning the
  seed/secret derivation to its did:key and KAK multibase values) now runs
  against the was-client home.