v0.2.1 — pre-adoption fix-forward

Two SDK schema bugs caught before bridge-ui's wallet-surface swap,
both flagged independently by wallet's defensive pass and bridge-ui's
pre-swap inspection.

Added: BridgeOut on /wallet typed-client surface (SignBridgeOutPayload
+ SignBridgeOutPayloadSchema; "BridgeOut" added to SignAction
discriminated union and SignActionKindSchema).

Fixed: encrypted_seed phantom field removed from GraduateResponseSchema
(wallet emits 6 fields under graduation, not 7; ciphertext is the
encrypted seed).

Wire shapes elsewhere unchanged. 548/548 tests pass.

Install:
  npm install git+https://gitlab.syncad.com/hive/velocity-js-sdk.git#v0.2.1