test: Add Comprehensive Unit Tests for Mainnet-Ready Staking & Liquidity Functions

[lohit-40]

Description

This PR complements PR #53 by introducing deterministic, high-quality unit tests for the mainnet-upgraded functions in lib/stakeF.ts and lib/contract.ts. These tests ensure the SDK correctly handles network switching and gracefully interacts with the Soroban RPC environment.

Changes

• Added tests/unit/lib/contract.test.ts (14 comprehensive test cases)
• Added tests/unit/lib/stakeF.test.ts (16 comprehensive test cases)
• Used robust module-level mocking (vi.mock) to intercept @stellar/stellar-sdk RPC and transaction building.
• Verified all edge cases, input formats, read-only simulations, and transaction failures without dialing out to a live, mutable network.
• Updated .env.example to document the new STELLAR_NETWORK and SOROBAN_RPC_URL variables.

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Summary by cubic

Adds deterministic unit tests for lib/stakeF.ts and lib/contract.ts to validate mainnet-ready staking and liquidity flows with mocked @stellar/stellar-sdk RPC. Updates env config for network selection and Soroban RPC, and fixes a missing type import in agent.ts.

• Bug Fixes

  • Align stakeF.test.ts call signatures with lib/stakeF.ts.
  • Import TargetChain in agent.ts to fix type usage.

• Migration

  • Set STELLAR_NETWORK to testnet or mainnet (default testnet).
  • Use SOROBAN_RPC_URL instead of SRB_PROVIDER_URL (keep as legacy alias if needed).

^{Written for commit 810d0ac. Summary will update on new commits.}

[cubic-dev-ai]

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