fix project settings regression

.github/copilot-instructions.md

@@ -29,23 +29,35 @@ Modern Lua-first Neovim configuration using lazy.nvim, currently in active migra
 ### 1. LSP Configuration (Phase 3 Complete)
 **Modern API (Neovim 0.11+)**: Uses `vim.lsp.config()` + `vim.lsp.enable()`, NOT `require('lspconfig')[server].setup()`.
 
+**CRITICAL (2025-12-07)**: Neovim 0.11+ does NOT support `on_new_config` callback. Use `LspAttach` autocmd instead.
+
 ```lua
 -- lua/plugins/lsp.lua pattern:
+-- Define config
 vim.lsp.config(server_name, {
   capabilities = capabilities,
-  on_attach = on_attach,
-  on_new_config = function(new_config, root_dir)
-    -- Load project settings from root_dir/.nvim.lua
+  -- NO on_attach here, NO on_new_config here
+})
+
+-- Enable server
+vim.lsp.enable({ "lua_ls", "intelephense", ... })
+
+-- Load project settings via LspAttach autocmd
+vim.api.nvim_create_autocmd('LspAttach', {
+  callback = function(args)
+    local client = vim.lsp.get_client_by_id(args.data.client_id)
+    -- Load .nvim.lua from client.root_dir
+    -- Merge into client.settings
+    -- Send workspace/didChangeConfiguration notification
   end,
 })
-vim.lsp.enable({ "lua_ls", "intelephense", ... })
 ```
 
 **Key decisions**:
 - No neoconf (incompatible with Neovim 0.11+, issue #116)
 - Native `exrc` + `secure` for project config (see settings.lua)
-- `on_new_config` hook loads from actual `root_dir`, not cwd
-- `workspace/didChangeConfiguration` sent in `on_attach` for servers like intelephense
+- Project settings loaded via `LspAttach` autocmd (NOT `on_new_config` which is deprecated)
+- `workspace/didChangeConfiguration` sent after merging settings into `client.settings`
 
 ### 2. Project-Local Configuration
 **Format**: `.nvim.lua` at project root, returns: