Handle each session initialization separately

[torkve]

This removes global initialized flag, because each session can be initialized separately.

Summary by CodeRabbit

• New Features
  • Improved session management now ensures that notifications are delivered only to fully active sessions, enhancing overall reliability.
  • Enhanced error handling prevents messages from being sent to sessions that aren’t completely set up, ensuring a more consistent update experience for users.

[coderabbitai[bot]]

Walkthrough

This pull request refactors session initialization across several server components. The changes add two new methods—Initialize() and Initialized() bool—to the session interfaces and structs, replacing the previous global atomic flag in the server. Client notification logic now verifies each session’s initialization state before proceeding. Test cases have been enhanced to validate the behavior of both initialized and uninitialized sessions.

Changes

Files	Summary
server/server.go	Added Initialize() and Initialized() bool to the ClientSession interface; removed the global atomic initialized flag; updated notification logic.
server/server_test.go	Updated fakeSession with an initialized field and the new methods; added tests (including an "uninit session" case) to check session initialization.
server/sse.go, server/stdio.go	Introduced an atomic.Bool field for session state and implemented Initialize() and Initialized() methods in both session structs.

Possibly related PRs

• mark3labs/mcp-go#46: This PR similarly modifies session management and notification handling by introducing new methods and fields in session-related structs.

✨ Finishing Touches

• [ ] 📝 Generate Docstrings

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