feat(morpho-sdk): add midnight action flows

Author: Rubilmax

.changeset/quiet-midnight-flows.md

@@ -0,0 +1,7 @@
+---
+"@morpho-org/morpho-sdk": minor
+---
+
+Add Midnight action flows under `client.morpho.midnight(chainId)` and expose pure Midnight transaction builders for fixed-rate taker, maker, redeem, repay/withdraw, and cancel flows.
+
+The Midnight entity returns lazy action outputs with `getRequirements()` and synchronous `buildTx(...)` methods, matching the existing `morpho-sdk` action pattern while accepting fixed-rate API quote takes directly. UI labels, rate display logic, and offer-chain presentation stay on the integrator side.

packages/morpho-sdk/AGENTS.md

@@ -1,13 +1,14 @@
 # `packages/morpho-sdk/`
 
-Transaction builders for VaultV1, VaultV2, and Blue. Subfolders carry the layer-scoped detail; this file is the package overview + glossary.
+Transaction builders for VaultV1, VaultV2, Blue, and Midnight. Subfolders carry the layer-scoped detail; this file is the package overview + glossary.
 
 > Architecture / type / test / doc / release rules apply per the [root `AGENTS.md`](../../AGENTS.md). Subfolder rules: see each `src/<layer>/AGENTS.md`.
 
 ## Routing summary
 
 - **VaultV1 / VaultV2 deposits** route through bundler3 via GeneralAdapter1 (which enforces `maxSharePrice`, protecting against inflation attacks). VaultV1/V2 `withdraw` and `redeem` are direct vault calls. VaultV2 `forceWithdraw` / `forceRedeem` use `multicall` with `forceDeallocate` calls before the final withdraw/redeem.
 - **Blue bundled paths** (`supply`, `supplyCollateral`, `borrow`, `supplyCollateralBorrow`, `repay`, `repayWithdrawCollateral`, `withdraw`) route through bundler3 via GeneralAdapter1. `repay` and `withdraw` each accept assets or shares (mutually exclusive); `repayWithdrawCollateral` repays first then withdraws. Loan-asset `supply` supports native wrapping when `loanToken === wNative`; loan-asset `withdraw` supports optional PublicAllocator reallocations to top up market liquidity (same mechanism as `borrow`).
+- **Midnight paths** expose lazy action outputs under `client.morpho.midnight(chainId)`. Fixed-rate market taker flows route through Midnight Bundles, direct collateral supply/cancel/redeem route through Midnight, and maker flows return root-ratification requirements plus the mempool payload transaction. The SDK owns protocol transactions and requirements; integrators keep UI labels, rate math, and display decisions.
 - **Bundle composition, native wrapping, and reallocation rules** are canonical in [`src/actions/AGENTS.md`](./src/actions/AGENTS.md).
 
 ## Tests
@@ -21,6 +22,7 @@ Protocol terms used across this package's docs and JSDoc:
 ### Contracts and adapters
 
 - **Blue / Morpho Blue** — Morpho's immutable, **variable-rate** lending primitive (formerly called "MarketV1" in this SDK). Each market is an isolated pair whose borrow rate floats with utilization, driven by the market's IRM. A market is identified by `MarketParams { loanToken, collateralToken, oracle, irm, lltv }`. Exposed via `client.blue(marketParams, chainId) → MorphoBlue`. This is the canonical definition of "Blue" for the whole package; other docs link here rather than redefine it.
+- **Midnight** — Morpho's fixed-rate lending primitive. Takers consume signed offers through Midnight Bundles; makers submit offer groups/trees to the Midnight mempool after Ecrecover signing or Setter ratification.
 - **VaultV1 / MetaMorpho** — ERC-4626 vault layered on top of Blue.
 - **VaultV2** — successor vault with adapter-based liquidity routing and `forceDeallocate`.
 - **bundler3** — the bundler entry point; receives a sequence of adapter actions in one transaction.

packages/morpho-sdk/package.json

@@ -93,6 +93,7 @@
   "dependencies": {
     "@morpho-org/blue-sdk": "workspace:^",
     "@morpho-org/blue-sdk-viem": "workspace:^",
+    "@morpho-org/midnight-sdk": "workspace:^",
     "@morpho-org/morpho-ts": "workspace:^",
     "zod": "^4.4.3"
   },

packages/morpho-sdk/src/actions/AGENTS.md

@@ -7,7 +7,9 @@ Pure synchronous transaction builders. Each action returns a deep-frozen `Transa
 - `vaultV1/` — VaultV1 (MetaMorpho) `deposit` / `withdraw` / `redeem` / `migrateToV2`.
 - `vaultV2/` — VaultV2 `deposit` / `withdraw` / `redeem` / `forceWithdraw` / `forceRedeem`.
 - `blue/` — Morpho Blue `supplyCollateral` / `borrow` / `supplyCollateralBorrow` / `repay` / `repayWithdrawCollateral` / `withdrawCollateral`. Borrow paths support optional shared liquidity via `reallocations`.
+- `midnight/` — Midnight fixed-rate direct and bundled transaction encoders plus take normalization for fixed-rate API quote outputs.
 - `requirements/` — token approvals, permit/permit2 signatures, Morpho authorization resolved before deposit/supply.
+  Midnight also uses this layer for Midnight authorization and Setter root-ratification prerequisites.
 
 ## Common builder pattern
 

packages/morpho-sdk/src/actions/index.ts

@@ -1,7 +1,9 @@
 export type { BlueActions } from "../entities/blue/index.js";
+export type { MidnightActions } from "../entities/midnight/index.js";
 export type { VaultV1Actions } from "../entities/vaultV1/index.js";
 export type { VaultV2Actions } from "../entities/vaultV2/index.js";
 export * from "./blue/index.js";
+export * from "./midnight/index.js";
 export * from "./requirements/index.js";
 export * from "./vaultV1/index.js";
 export * from "./vaultV2/index.js";