refactor(defi): rename example clob → order-book for discoverability

Every other example in defi/ uses plain words (amm, escrow, token-swap).
"clob" was the only opaque acronym. Renamed to "order-book" so the
directory listing reads cleanly; "CLOB" stays as the term inside the
README and code comments where the explanation makes it meaningful.

Renames applied:

  - Directory  defi/clob/                 → defi/order-book/
  - Directory  programs/clob/             → programs/order-book/
  - Cargo      name = "clob"              → name = "order_book"
  - Cargo lib  name = "clob"              → name = "order_book"
  - Anchor.toml [programs.localnet] clob = → order_book =
  - Rust mod   pub mod clob {…}           → pub mod order_book {…}
  - Test file  tests/test_clob.rs         → tests/test_order_book.rs
  - SBF .so    target/deploy/clob.so      → target/deploy/order_book.so
  - Keypair    clob-keypair.json          → order_book-keypair.json
                (same key bytes — program ID is unchanged)
  - Top-level repo README link to ./defi/clob/anchor → ./defi/order-book/anchor

README first-mention pattern updated: now leads with "**order book** —
specifically a **central limit order book (CLOB)**, …", subsequent
uses of "CLOB" as a term are preserved. Path references and code-block
commands in the README updated to the new layout.

Program ID stays at C69UJ8irfmHq5ysyLek7FKApHR86FBeupiz4JnoyPzzx — only
the names around it changed.

Tests: 24/24 pass under cargo test (LiteSVM).

Author: Edward (Mike's bot)

README.md

@@ -27,7 +27,7 @@ Constant product AMM (x·y=k) — create liquidity pools, deposit and withdraw l
 
 Order-book exchange — users post limit bids and asks at chosen prices, tokens are locked in program vaults, and orders cross against the opposing side using price-time priority. Fees route to a dedicated fee vault, maker/taker proceeds land in unsettled balances, and funds are withdrawn via `settle_funds`. A minimal teaching example of the mechanics behind Openbook and Phoenix.
 
-[⚓ Anchor](./defi/clob/anchor)
+[⚓ Anchor](./defi/order-book/anchor)
 
 ### Escrow
 

defi/clob/anchor/.gitignore defi/order-book/anchor/.gitignoredefi/clob/anchor/.gitignore renamed to defi/order-book/anchor/.gitignore

@@ -8,13 +8,13 @@ resolution = true
 skip-lint = false
 
 [programs.localnet]
-clob = "C69UJ8irfmHq5ysyLek7FKApHR86FBeupiz4JnoyPzzx"
+order_book = "C69UJ8irfmHq5ysyLek7FKApHR86FBeupiz4JnoyPzzx"
 
 [provider]
 cluster = "Localnet"
 wallet = "~/.config/solana/id.json"
 
 [scripts]
-# LiteSVM Rust tests live under `programs/clob/tests/` and include the built
+# LiteSVM Rust tests live under `programs/order-book/tests/` and include the built
 # `.so` via `include_bytes!`, so a fresh `anchor build` must run first.
 test = "cargo test"

defi/clob/anchor/Anchor.toml defi/order-book/anchor/Anchor.tomldefi/clob/anchor/Anchor.toml renamed to defi/order-book/anchor/Anchor.toml

@@ -1,15 +1,15 @@
-# CLOB — Central Limit Order Book
-
-An Anchor program that runs an **onchain central limit order book**
-(CLOB) for a single pair of token mints. Users post buy or sell offers
-at the prices they want, the program matches crossing offers in
-price-time priority, and settles the resulting token movements.
-
-A CLOB is the standard piece of financial-market infrastructure: NYSE,
-NASDAQ, LSE, and CME all run on one, and every major crypto venue
-(Binance, Coinbase, Openbook, Phoenix) implements the same idea. This
-program is a simplified, onchain version of that mechanism. Two simple
-Solana CLOBs you can read alongside it:
+# Order Book — Central Limit Order Book (CLOB)
+
+This is an **order book** — specifically, a **central limit order
+book (CLOB)**, the standard piece of market infrastructure used by
+NYSE, NASDAQ, LSE, CME, and every major crypto venue. An Anchor
+program that runs an onchain CLOB for a single pair of token mints:
+users post buy or sell offers at the prices they want, the program
+matches crossing offers in price-time priority, and settles the
+resulting token movements.
+
+This program is a simplified, onchain version of that mechanism. Two
+production Solana CLOBs to read alongside it:
 [Openbook v2](https://github.com/openbook-dex/openbook-v2) and
 [Phoenix](https://github.com/Ellipsis-Labs/phoenix-v1). Both use
 zero-copy slabs for scale; this example uses plain `Vec`s so the
@@ -232,7 +232,7 @@ just needs enough to pick what to cross next and re-derive the PDA.
 
 ### `Order` state
 
-From [`state/order.rs`](programs/clob/src/state/order.rs):
+From [`state/order.rs`](programs/order-book/src/state/order.rs):
 
 ```rust
 pub struct Order {
@@ -666,8 +666,8 @@ zero as a side effect of the transfer).
 
 This is the heart of the program. Everything in `place_order` after
 the initial fund lock is matching-engine work. Follow along with
-[`place_order.rs`](programs/clob/src/instructions/place_order.rs) and
-[`state/matching.rs`](programs/clob/src/state/matching.rs) — it'll
+[`place_order.rs`](programs/order-book/src/instructions/place_order.rs) and
+[`state/matching.rs`](programs/order-book/src/state/matching.rs) — it'll
 read more easily once you've gone through this section.
 
 ### 4.1 The plan
@@ -1060,7 +1060,7 @@ imagine a future instruction handler to reclaim its rent — see §8).
 
 ### 6.1 What the program refuses to do
 
-From [`errors.rs`](programs/clob/src/errors.rs):
+From [`errors.rs`](programs/order-book/src/errors.rs):
 
 | Error | When |
 |---|---|
@@ -1178,9 +1178,9 @@ A production CLOB would add:
 ## 7. Running the tests
 
 All tests are LiteSVM Rust integration tests under
-[`programs/clob/tests/test_clob.rs`](programs/clob/tests/test_clob.rs).
+[`programs/order-book/tests/test_order_book.rs`](programs/order-book/tests/test_order_book.rs).
 They load the built `.so` via
-`include_bytes!("../../../target/deploy/clob.so")`, so a build must
+`include_bytes!("../../../target/deploy/order_book.so")`, so a build must
 run first.
 
 ### Prerequisites
@@ -1191,14 +1191,14 @@ run first.
 
 ### Commands
 
-From `defi/clob/anchor/`:
+From `defi/order-book/anchor/`:
 
 ```bash
-# 1. Build the .so — target/deploy/clob.so
+# 1. Build the .so — target/deploy/order_book.so
 anchor build
 
 # 2. Run the LiteSVM tests
-cargo test --manifest-path programs/clob/Cargo.toml
+cargo test --manifest-path programs/order-book/Cargo.toml
 
 # Or equivalently (Anchor.toml scripts.test = "cargo test"):
 anchor test --skip-local-validator
@@ -1400,11 +1400,11 @@ in production.
 ## Code layout
 
 ```
-defi/clob/anchor/
+defi/order-book/anchor/
 ├── Anchor.toml
 ├── Cargo.toml
 ├── README.md              (this file)
-└── programs/clob/
+└── programs/order-book/
     ├── Cargo.toml
     ├── src/
     │   ├── errors.rs
@@ -1425,5 +1425,5 @@ defi/clob/anchor/
     │       ├── market_user.rs
     │       └── matching.rs           (pure fill-planning logic)
     └── tests/
-        └── test_clob.rs              LiteSVM tests
+        └── test_order_book.rs              LiteSVM tests
 ```

defi/clob/anchor/Cargo.toml defi/order-book/anchor/Cargo.tomldefi/clob/anchor/Cargo.toml renamed to defi/order-book/anchor/Cargo.toml

@@ -1,12 +1,12 @@
 [package]
-name = "clob"
+name = "order_book"
 version = "0.1.0"
-description = "Central limit order book on Solana"
+description = "Order book example (CLOB) on Solana"
 edition = "2021"
 
 [lib]
 crate-type = ["cdylib", "lib"]
-name = "clob"
+name = "order_book"
 
 [features]
 default = []