feat(realfi-partner-sdk): vendor RealFi partner SDK as BitGo fork

.eslintignore

@@ -1 +1,2 @@
-modules/babylonlabs-io-btc-staking-ts
+modules/babylonlabs-io-btc-staking-ts
+modules/realfi-partner-sdk

.prettierignore

@@ -8,4 +8,5 @@ CHANGELOG.md
 flake.lock
 
 modules/babylonlabs-io-btc-staking-ts/
+modules/realfi-partner-sdk/
 /.nx/workspace-data

.yarnrc

@@ -1 +1,2 @@
 registry "https://registry.npmjs.org"
+ignore-engines true

modules/realfi-partner-sdk/.gitignore

@@ -0,0 +1,10 @@
+node_modules/
+*.tsbuildinfo
+.nyc_output
+coverage
+*.log
+.env
+.DS_Store
+
+# Dist is vendored from upstream prebuild (see UPSTREAM.md). Root gitignore
+# ignores modules/**/dist/ — force-add dist when updating the pin.

modules/realfi-partner-sdk/README.md

@@ -0,0 +1,9 @@
+# @bitgo/realfi-partner-sdk
+
+BitGo fork of [`@realfi-co/realfi-partner-sdk`](https://github.com/realfi-co/realfi-partner-sdk) **v2.14.0**
+(`latest` / `preview` dist-tag; commit `1a8d3c0605f383e1180f8405075c08e14689ac47`).
+
+Used by Wallet Platform to build RealFi sUSDr Plutus order transactions on Cardano.
+BitGoJS `sdk-coin-ada` only pledge-signs the resulting CBOR — it does not depend on this package.
+
+See `UPSTREAM.md` for rebase notes. Ticket: SI-1292.

modules/realfi-partner-sdk/UPSTREAM.md

@@ -0,0 +1,42 @@
+# Upstream tracking
+
+| Field | Value |
+| --- | --- |
+| Upstream package | `@realfi-co/realfi-partner-sdk` |
+| Upstream version | `2.14.0` (`latest` / `preview` dist-tag) |
+| Upstream commit | `1a8d3c0605f383e1180f8405075c08e14689ac47` |
+| Built at | `2026-08-19T13:16:56.044Z` (from `dist/build-info.json`) |
+| BitGo package | `@bitgo/realfi-partner-sdk` (`private: true` until first npm create + publish) |
+| Ticket | [SI-1292](https://linear.app/bitgo/issue/SI-1292) |
+
+CI notes:
+- `engines.node` is `>=20` to match BitGoJS (upstream / `@cardano-sdk/core` want `>=22`; WP runtime is 22).
+- Root `.yarnrc` sets `ignore-engines true` so Node 20 CI can install those transitive deps (same class of issue as shipping Cardano SDK into this monorepo).
+- `private: true` skips `verify-npm-packages` until the package is created on npm; unset before first publish.
+
+## Related dist-tags (at pin time)
+
+| Tag | Version |
+| --- | --- |
+| latest / preview | 2.14.0 |
+| mainnet | 2.13.0 |
+| preprod | 2.12.3 |
+
+## Why a fork
+
+BitGo does not install third-party packages from GitHub Packages into Wallet Platform CI.
+This module vendors a pinned RealFi SDK snapshot under `@bitgo/*` (Babylon-style) for npm beta / WP consumption.
+
+## Rebase checklist
+
+1. `npm view @realfi-co/realfi-partner-sdk dist-tags --registry=https://npm.pkg.github.com`
+2. `npm pack @realfi-co/realfi-partner-sdk@<ver> --registry=https://npm.pkg.github.com`
+3. Replace `src/` + `dist/` + upstream `CHANGELOG.md`; refresh this file + `package.json` version/deps.
+4. Smoke: construct SDK for preprod, read vault rate, build a stake order tx.
+5. PR → merge → publish `@bitgo-beta` → bump WP.
+
+## Build note
+
+This snapshot ships **prebuilt** `dist/` from upstream (Babel dual CJS/ESM). Full upstream
+build tooling is not in the published tarball; porting a BitGo-native build is follow-up if
+we need to patch source frequently.

modules/realfi-partner-sdk/dist/build-info.json

@@ -0,0 +1,5 @@
+{
+  "version": "2.14.0",
+  "commit": "1a8d3c0605f383e1180f8405075c08e14689ac47",
+  "builtAt": "2026-08-19T13:16:56.044Z"
+}