Add Provider Capability Metadata

[Abd-Standard]

Description

Allow notification providers to expose supported capabilities such as rich formatting, attachments, or message updates.

Acceptance Criteria

Providers can declare supported capabilities.

Unsupported features are handled gracefully.

The core notification pipeline does not depend on a specific provider.

[Moh-dakai]

@Moh-dakai has applied to work on this issue as part of the Stellar Wave Program's 8th wave.

kindly assign

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

[drips-wave]

Congratulations, @Moh-dakai! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on August 31, 2026.

🧑‍💻 @Moh-dakai: 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

When opening a PR, please link it to this issue to ensure it gets tracked accurately. Points are awarded when this issue is marked as completed by the maintainer.

🤠 Repo maintainers: Please keep an eye on the contributor's progress and review their work before the due date. You can manage this issue, including adjusting its complexity and points, here.

🌊 Happy Wave 🌊

[grantfox-oss]

🎉 This issue has been marked as completed on GrantFox!

@Moh-dakai's PR #773 was approved and merged by @Abd-Standard.

🏆 @Moh-dakai: You earned 35 FoxPoints for this contribution! Your current tier: Explorer (506 total points). Track your full progress on GrantFox.

👏 Great work, @Moh-dakai! Keep contributing to Core-Foundry.