[Elevate341]

What does this PR do?

Implements atomic, graph-validated transaction transitions and account-scoped customer storage. Adds the standard SEP-10 /auth JSON flow while preserving legacy routes, and rolls back background services when startup fails.

How to test?

Run bun test (expected: all 510 tests pass) and bun run build. Focused lint passes for the changed TypeScript files. Full bun run lint currently reports repository-wide Prettier CRLF findings; bun run typecheck also reports an existing typing error in tests/runtime/transaction-watcher.unit.test.ts.

Checklist

• My code follows the code style of this project.
• I have added tests for my changes.
• I have updated the documentation accordingly.
• I have run bun run test and bun run lint locally.

Issue Reference

Closes #706
Closes #702
Closes #703
Closes #670

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@Elevate341 Great news! 🎉 Based on an automated assessment of this PR, the linked Wave issue(s) no longer count against your application limits.

You can now already apply to more issues while waiting for a review of this PR. Keep up the great work! 🚀

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[0xNgoo]

Correction: I verified maintainer edits are enabled for this PR. I’ll resolve the conflict and Type Check failures on the existing branch as 0xNgoo, preserving your PR and issue attribution. Please disregard my request for you to push the fix.