feat: IDL updates, PumpFun/PumpSwap instruction and utils, fast_fn, release notes

- idl: pump.json and pump_amm.json updates
- instruction: pumpfun.rs, pumpswap.rs and utils (pumpfun, pumpswap)
- common: fast_fn.rs
- docs: release_notes_v3.5.0.md

Made-with: Cursor

src/instruction/utils/pumpswap.rs

@@ -26,6 +26,9 @@ pub mod seeds {
     pub const USER_VOLUME_ACCUMULATOR_SEED: &[u8] = b"user_volume_accumulator";
     pub const GLOBAL_VOLUME_ACCUMULATOR_SEED: &[u8] = b"global_volume_accumulator";
     pub const FEE_CONFIG_SEED: &[u8] = b"fee_config";
+
+    /// Seed for pool v2 PDA (required by program upgrade, readonly at end of account list)
+    pub const POOL_V2_SEED: &[u8] = b"pool-v2";
 }
 
 /// Constants related to program accounts and authorities
@@ -139,6 +142,16 @@ pub const BUY_DISCRIMINATOR: [u8; 8] = [102, 6, 61, 18, 1, 218, 235, 234];
 pub const BUY_EXACT_QUOTE_IN_DISCRIMINATOR: [u8; 8] = [198, 46, 21, 82, 180, 217, 232, 112];
 pub const SELL_DISCRIMINATOR: [u8; 8] = [51, 230, 133, 164, 1, 127, 131, 173];
 
+/// Pool v2 PDA (seeds: ["pool-v2", base_mint]). Required at end of buy/sell/buy_exact_quote_in accounts.
+#[inline]
+pub fn get_pool_v2_pda(base_mint: &Pubkey) -> Option<Pubkey> {
+    let (pda, _) = Pubkey::find_program_address(
+        &[seeds::POOL_V2_SEED, base_mint.as_ref()],
+        &accounts::AMM_PROGRAM,
+    );
+    Some(pda)
+}
+
 // Find a pool for a specific mint
 pub async fn find_pool(rpc: &SolanaRpcClient, mint: &Pubkey) -> Result<Pubkey, anyhow::Error> {
     let (pool_address, _) = find_by_mint(rpc, mint).await?;