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Adds a failing regression test that reproduces the write tool hang reported in #22872. The write tool calls lsp.touchFile + lsp.diagnostics to enrich its output; if a matching LSP server spawns but never responds to the initialize request, the tool blocks on LSPClient.create's 45s withTimeout. The test configures a fake LSP server (hanging-lsp-server.js) that swallows every message and never replies, asserts the file is still written correctly, and checks the tool returns within 10s. On dev today the assertion fails with ~45s actual, proving the hang. The fix should make this green by bounding the diagnostic-enrichment tail.