Add SDK changelog automation with release notes generation

[Kingsman-99]

Overview

SDK releases currently have no structured changelog. Add tooling to auto-generate release notes from conventional commits and publish them to CHANGELOG.md on every release.

Acceptance Criteria

• Conventional commits enforced via commitlint + Husky pre-commit hook
• Commit types used: feat, fix, perf, refactor, test, docs, chore, breaking
• release-it or changesets configured to bump semver based on commit types
• CHANGELOG.md auto-generated on npm run release — grouped by feat, fix, perf, breaking
• Breaking changes section auto-populated from commits with BREAKING CHANGE: footer
• GitHub Release created automatically with the same notes
• npm publish runs as part of the release flow (dry-run mode available)
• Setup instructions in CONTRIBUTING.md

[rindicomfort]

@rindicomfort has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hello Maintainer,

Please I’d love to take this issue on. I’m a smart contract and full-stack developer with experience across OnlyDust, Drips Waves

My stack includes Rust, Soroban, Cairo, Solidity, and TypeScript. I can deliver a clean, tested, and well-documented solution within 24 hours of assignment.

Happy to start immediately. Thank yOU

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

[ambermartin681]

@ambermartin681 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

hello dear maintainer i would love to work along side you on this task sir.

ℹ️ Repo Maintainers: To accept this application, review their application or assign @ambermartin681 to this issue.

[drips-wave]

Congratulations, @ambermartin681! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @ambermartin681: 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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[drips-wave]

This issue has been completed by @ambermartin681 as part of the Stellar Wave Program's 6th Wave 🥳

😎 @ambermartin681: 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. You can also Leave a review to share your experience working on this issue.

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