[WIP] Fix Lua error in lsp_buffer_fix.lua: add type check for pairs() function

[Copilot]

Thanks for asking me to work on this. I will get started on it and keep this PR's description up to date as I form a plan and make progress.

Original prompt

Fix the Lua error in lsp_buffer_fix.lua where pairs() function is expecting a table but receiving a string. Add a type check before the pairs() call to validate that spec is a table. If spec is not a table, call the original validate function directly. The fix should add: if type(spec) ~= "table" then return original_validate(spec, opts) end before the for key, value in pairs(spec) do loop.

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