add supermaven (opt-in only)

fnl/plugins/init.fnl

@@ -171,13 +171,27 @@
          {lhs "<leader>aa" rhs "<cmd>ClaudeCodeDiffAccept<cr>" :desc "Accept diff"}
          {lhs "<leader>ad" rhs "<cmd>ClaudeCodeDiffDeny<cr>" :desc "Deny diff"}]}
 
+ ;; Supermaven - AI code completion
+ {repo "supermaven-inc/supermaven-nvim"
+  :event "InsertEnter"
+  :opts {:disable_inline_completion true}}
+
  ;; blink.cmp - Fast completion engine with LSP support
  {repo "saghen/blink.cmp"
   :version "*"
   :event ["InsertEnter" "CmdlineEnter"]
-  :opts {:keymap {:preset "super-tab"}
-         :completion {:documentation {:auto_show true}}
-         :sources {:default ["lsp" "path" "buffer"]}}}
+  :dependencies ["supermaven-inc/supermaven-nvim"]
+  :opts {:keymap {:preset "super-tab"
+                  "<C-Space>" [(fn [cmp] (cmp.show {:providers ["supermaven"]})) :fallback]
+                  "<Tab>" [:select_and_accept :snippet_forward :fallback]
+                  "<CR>" [:select_and_accept :fallback]}
+         :completion {:trigger {:show_on_keyword false
+                                :show_on_trigger_character false}
+                      :list {:selection {:preselect true :auto_insert false}}
+                      :documentation {:auto_show true}}
+         :sources {:default ["lsp" "supermaven" "path" "buffer"]
+                   :providers {:supermaven {:name "Supermaven"
+                                            :module "supermaven-blink"}}}}}
 
  ;; gitsigns.nvim - Git diff signs in the sign column
  {repo "lewis6991/gitsigns.nvim"