Workspace: fix duplicate `[workspace].members` in root `Cargo.toml`

[greatest0fallt1me]

Description

Ensure the workspace includes vault, revenue_pool, and settlement exactly once each (as product intends) and cargo metadata succeeds.

Requirements and context

• CI must use a coherent workspace graph.
• Update README layout tree if needed.

Suggested execution

• Fork the repo and create a branch: git checkout -b fix/workspace-cargo-members
• Implement changes in the Callora-Contracts Soroban workspace (contracts/*/src/).
• Run cargo fmt, cargo clippy --all-targets --all-features -- -D warnings, and cargo test from the workspace root.
• For WASM release builds: cargo build --target wasm32-unknown-unknown --release -p callora-vault (adjust -p if the crate name differs).

Deliverables

• Edit Callora-Contracts/Cargo.toml.
• Run cargo test --workspace.

Test and commit

• Run tests and ./scripts/coverage.sh (or cargo tarpaulin per tarpaulin.toml).
• Cover edge cases; include summarized test output and brief security notes in the PR description.

Example commit message

fix(workspace): correct Cargo workspace members list

Guidelines

• Minimum 95% line coverage for touched crates (workspace policy).
• Clear documentation (Rust /// on public items where applicable; repo markdown as needed).
• Timeframe: 96 hours from assignment unless agreed otherwise.

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[AbuTuraab]

@AbuTuraab has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

Hi, please assign this to me

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Congratulations, @AbuTuraab! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

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[AbuTuraab]

hi @greatest0fallt1me checking through this issue, I found out that Cargo.toml doesnt include any duplicate workspace, I would be glad if you could check once again.