General: Add release train cadence and freeze-window policy

[Junirezz]

Establish predictable release train cadence with freeze windows and exception handling.

[believetimothy]

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

Hello Maintainer, I can fix this issue.

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[devOnyx-01]

@devOnyx-01 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Please can i be assigned this task

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[drips-wave]

Congratulations, @devOnyx-01! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on June 30, 2026.

🧑‍💻 @devOnyx-01: 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 @devOnyx-01 as part of the Stellar Wave Program's 6th Wave 🥳

😎 @devOnyx-01: 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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