Define backward-compatible behavior for session persistence, expiration, and invalidation in `src/auth/session.ts`

[Jagadeeshftw]

Description

The surface needs an explicit compatibility story so future changes do not break existing callers. src/auth/session.ts owns session persistence, expiration, and invalidation, but the current behavior does not yet define the contract tightly enough for safe maintenance. Design the change so the runtime path, tests, and docs all describe the same behavior.

Requirements and context

• Keep the contract specific to src/auth/session.ts and its existing callers.
• Add coverage for the success path and the failure or boundary path relevant to this issue.
• Preserve compatibility where older callers or existing tests already rely on the current shape.
• Keep the change easy to review and small enough for one focused PR.

Suggested execution

Fork the repo and create a branch

git checkout -b session-lifecycle-compatibility-128

Implement changes

• Update/Write: src/auth/session.ts
• Write comprehensive tests: src/auth/session.test.ts
• Add documentation: docs/auth/session.md
• Keep any new helper names consistent with the rest of src/

Test and commit

• Run pnpm test
• Run pnpm lint
• Add a note for any edge cases that are intentionally out of scope

Example commit message

docs: document backward-compatible backend behavior

Guidelines

• WCAG 2.1 AA is not relevant here; keep the focus on correctness and maintainability.
• Prefer a narrow, well-documented fix over a broad refactor.
• Timeframe: 96 hours

[bright5455]

@bright5455 has applied to work on this issue as part of the Stellar Wave Program's 7th wave.

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Congratulations, @bright5455! 🎉 Your application was accepted by the repo's maintainers, and the issue is due on July 30, 2026.

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[Jagadeeshftw]

Thanks for applying here. Please also join our Telegram group here: https://t.me/+vTbe0hOUKrFhNTJl. It helps us keep communication clear while we review contributions.

[bright5455]

my PR has been merged but i havent received any point
talking about linking of issue
closes#314

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This issue has been completed by @bright5455 as part of the Stellar Wave Program's 7th Wave 🥳

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