fix: enable cpi_context in tree info lookups and add docs

- types.rs: Use tree_info.cpi_context from QUEUE_TREE_MAPPING instead of None
  in V1 API compatibility layer. This ensures CPI context is properly propagated.
- constants.rs: Add documentation for address lookup table constants explaining
  their purpose in reducing transaction size.

Author: ananas-block

sdk-libs/client/src/constants.rs

@@ -1,11 +1,21 @@
 use solana_pubkey::{pubkey, Pubkey};
 
+/// Address lookup table containing state Merkle tree pubkeys for mainnet-beta.
+/// Used to reduce transaction size by referencing trees via lookup table indices.
 pub const STATE_TREE_LOOKUP_TABLE_MAINNET: Pubkey =
     pubkey!("7i86eQs3GSqHjN47WdWLTCGMW6gde1q96G2EVnUyK2st");
+
+/// Address lookup table containing nullifier queue pubkeys for mainnet-beta.
+/// Used to reduce transaction size by referencing queues via lookup table indices.
 pub const NULLIFIED_STATE_TREE_LOOKUP_TABLE_MAINNET: Pubkey =
     pubkey!("H9QD4u1fG7KmkAzn2tDXhheushxFe1EcrjGGyEFXeMqT");
 
+/// Address lookup table containing state Merkle tree pubkeys for devnet.
+/// Used to reduce transaction size by referencing trees via lookup table indices.
 pub const STATE_TREE_LOOKUP_TABLE_DEVNET: Pubkey =
     pubkey!("8n8rH2bFRVA6cSGNDpgqcKHCndbFCT1bXxAQG89ejVsh");
+
+/// Address lookup table containing nullifier queue pubkeys for devnet.
+/// Used to reduce transaction size by referencing queues via lookup table indices.
 pub const NULLIFIED_STATE_TREE_LOOKUP_TABLE_DEVNET: Pubkey =
     pubkey!("5dhaJLBjnVBQFErr8oiCJmcVsx3Zj6xDekGB2zULPsnP");

sdk-libs/client/src/indexer/types.rs

@@ -298,7 +298,7 @@ impl ValidityProofWithContext {
                         tree_type: tree_info.tree_type,
                         tree: tree_pubkey,
                         queue: tree_info.queue,
-                        cpi_context: None,
+                        cpi_context: tree_info.cpi_context,
                         next_tree_info: None,
                     },
                 })