Cardano Updates

All crypto operations (hashing, KDF, HMAC, symmetric encryption,
Ed25519, extended key ops, RNG, CRC32) are now accessed through
a single facade module. This creates a clean seam for swapping
the crypto backend (e.g. libsodium for WASM, pure-Haskell, or
WebCrypto for JS).

No semantic changes — this is a pure refactor.

From https://github.com/IntersectMBO/ouroboros-consensus at eceb689e1fac3f037ee4689a6237a83b8a7243ca

feat: decouple dapps from gateway, introduce shared packages

Add HasCallStack to standalone functions that call error directly or
indirectly (via fromMaybe impossible), so that call stacks are captured
in error messages. Class methods are left unconstrained since the
failing instances (castVerificationKey extended key conversions,
ByronKeyLegacy deterministicSigningKey) guard impossible code paths.
Also improve Dijkstra-era placeholder error messages to be more
descriptive.

Add HasCallStack to standalone functions that call error directly or
indirectly (via fromMaybe impossible), so that call stacks are captured
in error messages. Class methods are left unconstrained since the
failing instances (castVerificationKey extended key conversions,
ByronKeyLegacy deterministicSigningKey) guard impossible code paths.
Also improve Dijkstra-era placeholder error messages to be more
descriptive.

Signed-off-by: Ales Verbic <[email protected]>

`body_base64` is always decoded as Base64 by the receiving side
(`json_to_response`), so putting raw error strings there caused
decode failures that masked the real error.

Signed-off-by: Chris Gianelloni <[email protected]>