refactor(token-swap): split state.rs into state/ directory

Match the convention used by the majority of non-trivial Anchor examples
in this repo (escrow, anchor-program-example, carnival, close-account,
cutils, etc.): one struct per file under a state/ module, with mod.rs
re-exporting the contents.

  state/mod.rs         - re-exports Config and PoolConfig
  state/config.rs      - Config struct (program-level singleton)
  state/pool_config.rs - PoolConfig struct (per-pool identity record)

Pure structural refactor. No behaviour, field, or doc changes. All
downstream imports (`use crate::state::{Config, PoolConfig}`) continue
to work via the glob re-export. Build clean, 18/18 integration tests
pass, no new warnings.

Author: Edward (Mike's bot)

tokens/token-swap/anchor/programs/token-swap/src/state/config.rs

@@ -0,0 +1,34 @@
+use anchor_lang::prelude::*;
+
+/// Shared configuration for the AMM (admin + trading fee).
+///
+/// `Config` is a singleton: one account per deployed program, seeded by the
+/// fixed byte string `b"config"`. This mirrors how real DEXs are deployed in
+/// practice (e.g. Phoenix and Raydium ship one program per market/AMM, so the
+/// program-level config is global by construction). Parameterising the config
+/// by an `id` was leftover complexity from the original example; removing it
+/// makes the on-chain layout simpler and matches realistic deployment.
+#[account]
+#[derive(Default, InitSpace)]
+pub struct Config {
+    /// Account that has admin authority over the AMM.
+    pub admin: Pubkey,
+
+    /// The trading fee taken on each swap, in basis points (out of 10_000).
+    ///
+    /// This is the *total* fee charged on a swap. It is split between LPs and
+    /// the admin according to `admin_share_bps`.
+    pub fee: u16,
+
+    /// Fraction of the trading fee that goes to the admin, in basis points
+    /// (out of 10_000). The remainder goes to LPs (it stays in the pool
+    /// reserves and grows the LP-claimable balance).
+    ///
+    /// Modelled on Uniswap V2 / Raydium: the AMM operator takes a slice of
+    /// every fee, LPs keep the rest. Set in `create_config`; fixed for the
+    /// lifetime of the program. Must be `< 10_000`.
+    pub admin_share_bps: u16,
+
+    /// Canonical bump for this PDA.
+    pub bump: u8,
+}

tokens/token-swap/anchor/programs/token-swap/src/state/mod.rs

@@ -0,0 +1,5 @@
+pub mod config;
+pub mod pool_config;
+
+pub use config::*;
+pub use pool_config::*;

…/anchor/programs/token-swap/src/state.rs …rams/token-swap/src/state/pool_config.rstokens/token-swap/anchor/programs/token-swap/src/state.rs renamed to tokens/token-swap/anchor/programs/token-swap/src/state/pool_config.rs tokens/token-swap/anchor/programs/token-swap/src/state.rs renamed to tokens/token-swap/anchor/programs/token-swap/src/state/pool_config.rs

@@ -1,38 +1,5 @@
 use anchor_lang::prelude::*;
 
-/// Shared configuration for the AMM (admin + trading fee).
-///
-/// `Config` is a singleton: one account per deployed program, seeded by the
-/// fixed byte string `b"config"`. This mirrors how real DEXs are deployed in
-/// practice (e.g. Phoenix and Raydium ship one program per market/AMM, so the
-/// program-level config is global by construction). Parameterising the config
-/// by an `id` was leftover complexity from the original example; removing it
-/// makes the on-chain layout simpler and matches realistic deployment.
-#[account]
-#[derive(Default, InitSpace)]
-pub struct Config {
-    /// Account that has admin authority over the AMM.
-    pub admin: Pubkey,
-
-    /// The trading fee taken on each swap, in basis points (out of 10_000).
-    ///
-    /// This is the *total* fee charged on a swap. It is split between LPs and
-    /// the admin according to `admin_share_bps`.
-    pub fee: u16,
-
-    /// Fraction of the trading fee that goes to the admin, in basis points
-    /// (out of 10_000). The remainder goes to LPs (it stays in the pool
-    /// reserves and grows the LP-claimable balance).
-    ///
-    /// Modelled on Uniswap V2 / Raydium: the AMM operator takes a slice of
-    /// every fee, LPs keep the rest. Set in `create_config`; fixed for the
-    /// lifetime of the program. Must be `< 10_000`.
-    pub admin_share_bps: u16,
-
-    /// Canonical bump for this PDA.
-    pub bump: u8,
-}
-
 /// Per-pool configuration / identity record.
 ///
 /// Holds the metadata that identifies a single pool: which `Config` it belongs