Implement `Network::passphrase()` returning the official Stellar strings.

[Emrys02]

Transaction signatures require the correct network passphrase to validate the hash. Providing the wrong passphrase results in rejected transactions.

Implementation Guidelines

Key Files: crates/core/src/network/config.rs.

• Implement a passphrase(&self) -> &str method on the Network enum that returns the correct static string for each environment (e.g., "Public Global Stellar Network ; September 2015").

Expectations

What done looks like: Any component can retrieve the perfectly matched network passphrase for signature generation.

For any question, reach me on Discord: emry_ss

[N-thnI]

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

Dear maintainer
Please assign me this issue

ℹ️ Repo Maintainers: To accept this application, review their application or assign @N-thnI to this issue.

[drips-wave]

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

🧑‍💻 @N-thnI: Please resolve the issue such that the repo's maintainers have enough time to review your contribution before the due date. You'll earn Points for completing the issue on-time, which will make you eligible for a share of the Stellar Wave Program's reward pool.

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