Add --save flag to export JSON reports

[Emrys02]

Add a --save flag to automatically write the transaction analysis to a file.

Context

Saves users from having to redirect stdout and allows for simultaneous terminal and file output.

Implementation Guidelines

Key Files: crates/cli/src/main.rs.

• If the flag is set, write the JSON representation to the specified path.

Expectations

What done looks like: prism trace <hash> --save report.json produces the file and still shows the terminal UI.

For any question, reach me on Discord: emry_ss

[Danto1606]

@Danto1606 has applied to work on this issue as part of the Stellar Wave Program's 3rd wave.

I will like to work on this

ℹ️ Repo Maintainers: To accept this application, review their application or assign @Danto1606 to this issue.

[drips-wave]

Congratulations, @Danto1606! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on March 30, 2026.

🧑‍💻 @Danto1606: 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.

Warning

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🌊 Happy Wave 🌊

[drips-wave]

This issue has been marked as completed by a Drips Wave moderator for @Danto1606 as part of the Stellar Wave Program's 3rd Wave 🥳

Moderator's reason: [Auto-assessed] The contributor successfully implemented the requested --save flag as a global option in PR #73. The PR addresses the issue requirements across all relevant subcommands, includes unit tests for the CLI parsing, and was merged by the maintainers.

😎 @Danto1606: You earned 200 Points for completing this issue! After the current Wave ends, you'll be eligible for a percentage of the Wave's reward pool based on the percentage of total points you've earned. Learn more here.

🧑‍💻 Repo maintainers: How'd the contributor do? Leave a review to share your experience working with them.

ℹ️ Note: This issue was marked complete via moderation. Points were issued even though the GitHub issue remains open.