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Merge bitcoindevkit/bdk_wallet#275: Multipath descriptor support (BIP 389)

da0b57713 Update wallet/src/wallet/params.rs (Andreas Schjønhaug)
9e3adf229 feat(wallet): add multipath descriptor support for two-path descriptors (Andreas Schjønhaug)

Pull request description:

  ### Description

  #### Key Features:
    - New API: `Wallet::create_multipath(descriptor)` following the same pattern as `create()` and `create_single()`
    - [BIP 389](https://github.com/bitcoin/bips/blob/master/bip-0389.mediawiki) compliance with exactly 2-path validation (receive and change)
    - Robust validation with clear error messages
    - Pattern consistency with existing wallet creation methods

   #### Usage Example:

  ```rust
  let multipath_desc = "wpkh([9a6a2580/84'/1'/0']tpub.../‹0;1›/*)";
  let wallet = Wallet::create_multipath(multipath_desc)
        .network(Network::Testnet)
        .create_wallet_no_persist()?;

  // Automatically creates separate receive and change descriptors
  let receive_addr = wallet.peek_address(KeychainKind::External, 0);  // Uses path /0/*
  let change_addr = wallet.peek_address(KeychainKind::Internal, 0);   // Uses path /1/*
  ```

  ### Notes to the reviewers

  #### Design Decisions:
    1. Pattern Consistency: Uses `make_multipath_descriptor_to_extract()` helper following the same pattern as existing `make_descriptor_to_extract()` function
    2. Lazy Evaluation: Descriptor parsing only happens when needed during wallet creation, not during parameter setup - this maintains performance and follows Rust's lazy evaluation patterns
    3. Strict Validation: Only allows exactly 2-path multipath descriptors to ensure proper receive/change separation
    4. API Consistency: The `create_multipath()` method returns `CreateParams` just like `create()` and `create_single()`, maintaining the fluent builder pattern

  #### Implementation Notes:
    - The function calls `make_multi... (continued)

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Source Files on job 16656352974.1