fix(#328): wire commitments module into lending contract with public exports

[danieloche635-bit]

Summary

Wires the existing conditional borrow commitments module into the LendingContract, exposing the commitment lifecycle endpoints and making commitment types publicly accessible.

Changes

Integration

• Added mod commitments; module declaration to lending contract lib.rs
• Added pub use commitments::{...} to publicly export commitment types (CommitmentStatus, PriceTrigger, TriggerCombiner, BorrowCommitment, CommitmentError)
• Added #[cfg(test)] mod commitments_test; to include the commitment test suite

New Contract Endpoints

• create_borrow_commitment(owner, triggers, combiner, borrow_asset, collateral_asset, borrow_amount, collateral_amount, min_fill_bps, expiry) - Create a conditional borrow commitment with oracle price triggers
• cancel_borrow_commitment(owner, commitment_id) - Cancel a pending commitment (owner only)
• execute_borrow_commitment(commitment_id) - Execute a commitment if triggers are met (anyone can call)
• get_borrow_commitment(commitment_id) - View a commitment by ID

Acceptance Criteria

• Commitment creation with rate, amount, duration
• Settlement mechanism using forward rate / oracle triggers
• Collateralization of commitment positions
• Default handling with penalty logic (expiry handling)
• Integration with existing lending markets

Files Changed

• stellar-lend/contracts/lending/src/lib.rs - Module integration and endpoint wiring

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If this PR is for one of the issues assigned to you as part of a Wave, please link it to ensure your contribution is tracked properly. You can do this by adding a keyword to the PR description (e.g., Closes #123), or by clicking a button below:

Issue	Title
#327	Add rebalancing engine for autonomous portfolio management	Link to this issue
#328	Implement commitment-based lending with forward rate agreements	Link to this issue
#326	Build institutional-grade multisig wallet with spending limits	Link to this issue

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