refactor: pass ServerCallContext to TaskStore

[ishymko]

Description

Pass ServerCallContext to TaskStore to allow DB-backed stores. Enhance comments for User, stating that userName is a unique identifier.

Re #213

[gemini-code-assist]

Summary of Changes

Hello @ishymko, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors the TaskStore interface to allow for more flexible and robust implementations, particularly those that might rely on database interactions, by introducing an optional ServerCallContext. Additionally, it improves the clarity and maintainability of the User interface by adding comprehensive JSDoc comments, ensuring that the purpose and unique nature of the userName property are well-documented.

Highlights

• TaskStore Context: The TaskStore interface methods, save and load, now accept an optional ServerCallContext parameter. This change is intended to facilitate the development of database-backed task stores by providing necessary call context.
• User Interface Documentation: Enhanced JSDoc comments have been added to the User interface and its properties, explicitly clarifying that userName serves as a unique identifier for the user.

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[gemini-code-assist]

Code Review

This pull request refactors the TaskStore interface to accept a ServerCallContext, which is a good improvement for enabling database-backed stores. The documentation for the User interface has also been enhanced for clarity. My main feedback is a critical issue in src/server/store.ts: the change to the TaskStore interface breaks existing implementations like InMemoryTaskStore and the test mock MockTaskStore, which will cause the build to fail. These implementations need to be updated to match the new interface signatures.