Fix missing organization slug

[cursor]

Refactors the use_sentry tool to directly wrap MCP tool handlers for embedded agents, ensuring constraint injection (e.g., organizationSlug) is consistently applied.

The previous use_sentry architecture used an in-memory MCP server, which failed to re-inject session-level constraints into tool call parameters when the embedded agent executed them. This led to tools like search_errors failing due to missing required slugs. The new wrapper-based approach explicitly injects these constraints directly before calling the real tool handlers, guaranteeing all necessary parameters are present.

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[cursor]

Cursor Agent can help with this pull request. Just @cursor in comments and I'll start working on changes in this branch.
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