Auto version-bump PR from Conventional Commits

[nanaf6203-bit]

Problem Statement
The CHANGELOG is hand-maintained. Tag-driven deploys hint at version
practices but the actual bumps happen manually.

Why it matters
A bot PR per release is auditable, deterministic, and easy to amend.

Acceptance Criteria

• Action: on push to main, scan commit messages, produce a PR
  updating Cargo.toml version + CHANGELOG.md "Unreleased"
  section.
• PR is labeled release.

Files/Modules Affected

• .github/workflows/version-bump.yml (new)

Difficulty Medium. Estimated Effort M.

Labels
area:ci, area:dx, priority:medium

---

Imported from docs/open-issues-draft.md as draft issue #40 (commit 7becd4b). Original draft-order cross-references in this body have been remapped to current GitHub issue numbers at import time.

[GBOYEE]

Hi team — I'd like to take this on as part of the GrantFox campaign. I'll implement it and open a PR referencing this issue shortly.

[Primex-hub]

I would love to solve this issue and I can submit within 24hrs

[Sensei-Victor]

I have experience with web development using HTML, CSS, and JavaScript, as well as working with GitHub and open-source projects. I would approach this issue by first understanding the existing code and expected behavior, then implementing the change carefully and testing it to make sure it works correctly without affecting existing functionality. I would also follow the project’s contribution guidelines and keep the changes focused and easy to review.

[grantfox-oss]

🦊 GrantFox — @Sensei-Victor has been assigned to this issue as part of the Official Campaign | FWC26 campaign!

Next steps:

1. Open a Pull Request referencing this issue (e.g., Closes #100)
2. Your PR will be reviewed by the StellarTips maintainers

Good luck! Track your progress on GrantFox.