Updated liquidity_pool Cargo.toml to include emergency_guard dependency

[aabxtract]

Description

This PR fixes a workspace dependency resolution issue by properly registering the newly created emergency_guard crate. While the crate was correctly specified as a dependency in the liquidity_pool contract, it was missing from the root workspace configuration, which prevented proper workspace-level builds and lockfile resolution.

Closes #207

Changes Made

• Added "contracts/emergency_guard" to the members array in the root Cargo.toml.

Why is this needed?

Adding new contracts to the Cargo workspace members array ensures they are included in workspace-wide commands (like cargo check, cargo build, and cargo test). It also ensures they share the unified Cargo.lock file, which is required for the liquidity_pool contract to correctly resolve the local path = "../emergency_guard" dependency.

How to Test

1. Run cargo check at the workspace root to confirm all crates, including emergency_guard and liquidity_pool, resolve without errors.
2. Run cargo build -p liquidity_pool to verify the contract compiles successfully with the new dependency.

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