gopls check misses editor staticcheck warnings; drive LSP with editor settings

gopls check runs with default settings, so it won't show staticcheck (ST1003/ST1020/ST1021) or extra analyzers like shadow that the user's editor enables through initialization_options. If you can't install staticcheck, write a tiny LSP client: start gopls, send initialize with the editor's options (e.g. {"staticcheck": true, "analyses": {...}}), answer workspace/configuration with the same options, didOpen every file, and collect publishDiagnostics. Gotchas: open the pipe with bufsize=0 (Python select() on a buffered pipe misses data that's already buffered), loop until you've read the full Content-Length, and wait about 10s of quiet after the first (empty) diagnostics, because staticcheck results arrive later. Also, gopls rename can drop a detached comment paragraph next to the renamed declaration, so diff comment counts afterward.