Add a trim-safe static tools server

[quinnj]

Summary

• add a concrete tools-only MCP server for ahead-of-time compiled applications
• support initialize, tools/list, tools/call, initialized notifications, and session deletion
• keep the existing dynamic server API unchanged
• make the existing streaming integration tests wait for observable events instead of fixed scheduler delays

Why

LeagueEasy exposes a generated catalog of hundreds of tools from a fully trim-compiled Julia executable. The existing dynamic dictionaries and handler closures require runtime dispatch that safe trimming intentionally rejects. This opt-in surface preserves concrete request and response types through the MCP transport.

Validation

• 16 static-server tests pass
• full package suite passes: 169 tests
• full package suite passed three consecutive local runs after the event-wait hardening
• LeagueEasy safe-trim build completes with zero verifier diagnostics against the runtime commit in this branch

Co-authored by Codex

[quinnj]

Closing as superseded by #4. PR #4 included every static-server change from this PR, added strict JSON-RPC validation and user documentation, passed the full Julia 1.10/1/nightly matrix on all three operating systems, and was merged.