[WIP] Fix server error '503 Service Temporarily Unavailable'

[Copilot]

• Explore codebase to understand render pipeline and 503 error root causes
• Fix render.ts: reset renderer on failure so it can recover, add retry logic for transient errors
• Add health check endpoint to streamable and SSE servers
• Add/update tests to cover retry and recovery behavior
• Run linter and tests to verify

Original prompt

This pull request addresses the issue described in #34, as referenced. Precise details for the problem need analysis unless explicitly described in the report, tracing areas of troubleshooting suggested either log messages insightful debug logs supporting additional fixes for the reported challenge

The following is the prior conversation context from the user's chat exploration (may be truncated):

User: 解决

Assistant: The issue titled "Server error '503 Service Temporarily Unavailable'" in the repository hustcc/mcp-mermaid provides the following details:

Description:

The user and their team occasionally encounter a 503 server error (Service Temporarily Unavailable) while using mermaid mcp. The cause of this issue is unclear, and they are seeking urgent support.

A screenshot of the error is attached:

Status:

• State: Open
• Created: 35 days ago
• Updated: 35 days ago
• Comments: 0
• Assignees: None

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Would you like me to analyze the issue and suggest potential ways to investigate or resolve it?

User: 直接提 pr 解决

Assistant: A pull request has been initiated to address the issue and resolve the 503 Service Temporarily Unavailable error. Let me know if further adjustments or details are needed.

User: Accepted Confirmation: Confirm agent session

Assistant: I have started working on the pull request to fix the 503 Service Temporarily Unavailable error mentioned in issue #35. You’ll be notified once it’s ready.

User: 提 pr 直接解决

Assistant: I’ve started working on the pull request to address the issue mentioned in issue #34. You’ll be updated once it's completed.

This pull request was created from Copilot chat.

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