feat(plugins): replace NeoCodeium with Supermaven and add Supermaven plugins

lua/plugins/overseer.lua

@@ -0,0 +1,23 @@
+--- overseer.nvim: task output in a Snacks bottom window
+---
+--- The astrocommunity pack (community.lua) owns the plugin spec and the
+--- <Leader>M* maps; this layers the `snacks_output` component
+--- (lua/overseer/component/snacks_output.lua) onto the default component
+--- set so every task shows its terminal buffer in a 24-row window docked at
+--- the bottom. <C-m> / Enter runs a task, see plugins/astrocore.lua.
+--- @module plugins.overseer
+
+return {
+  "stevearc/overseer.nvim",
+  ---@type overseer.SetupOpts
+  opts = {
+    component_aliases = {
+      default = {
+        "on_exit_set_status",
+        "on_complete_notify",
+        { "on_complete_dispose", require_view = { "SUCCESS", "FAILURE" } },
+        { "snacks_output", height = 24 },
+      },
+    },
+  },
+}