docs(v3.5.0): update README for integrated mg_dotfiles and security improvements

- Integrated mg_dotfiles as regular directory (not submodule)
- Added .zshrc.local.example template for local configs without secrets
- Added mg_dotfiles/zsh/.zshrc.local to .gitignore to protect API keys
- Updated README to reflect mg_dotfiles integration and new structure
- Added nvim configuration directory with LazyVim setup

mg_dotfiles/nvim/lua/plugins/opencode.lua

@@ -0,0 +1,117 @@
+return {
+  "NickvanDyke/opencode.nvim",
+  dependencies = {
+    { "folke/snacks.nvim", opts = { input = {}, picker = {}, terminal = {} } },
+  },
+  keys = {
+    {
+      "<leader>aa",
+      function()
+        require("opencode").toggle()
+      end,
+      mode = { "n" },
+      desc = "Toggle OpenCode",
+    },
+    {
+      "<leader>as",
+      function()
+        require("opencode").select({ submit = true })
+      end,
+      mode = { "n", "x" },
+      desc = "OpenCode select",
+    },
+    {
+      "<leader>ai",
+      function()
+        require("opencode").ask("", { submit = true })
+      end,
+      mode = { "n", "x" },
+      desc = "OpenCode ask",
+    },
+    {
+      "<leader>aI",
+      function()
+        require("opencode").ask("@this: ", { submit = true })
+      end,
+      mode = { "n", "x" },
+      desc = "OpenCode ask with context",
+    },
+    {
+      "<leader>ab",
+      function()
+        require("opencode").ask("@file ", { submit = true })
+      end,
+      mode = { "n", "x" },
+      desc = "OpenCode ask about buffer",
+    },
+    {
+      "<leader>ap",
+      function()
+        require("opencode").prompt("@this", { submit = true })
+      end,
+      mode = { "n", "x" },
+      desc = "OpenCode prompt",
+    },
+    -- Built-in prompts
+    {
+      "<leader>ape",
+      function()
+        require("opencode").prompt("explain", { submit = true })
+      end,
+      mode = { "n", "x" },
+      desc = "OpenCode explain",
+    },
+    {
+      "<leader>apf",
+      function()
+        require("opencode").prompt("fix", { submit = true })
+      end,
+      mode = { "n", "x" },
+      desc = "OpenCode fix",
+    },
+    {
+      "<leader>apd",
+      function()
+        require("opencode").prompt("diagnose", { submit = true })
+      end,
+      mode = { "n", "x" },
+      desc = "OpenCode diagnose",
+    },
+    {
+      "<leader>apr",
+      function()
+        require("opencode").prompt("review", { submit = true })
+      end,
+      mode = { "n", "x" },
+      desc = "OpenCode review",
+    },
+    {
+      "<leader>apt",
+      function()
+        require("opencode").prompt("test", { submit = true })
+      end,
+      mode = { "n", "x" },
+      desc = "OpenCode test",
+    },
+    {
+      "<leader>apo",
+      function()
+        require("opencode").prompt("optimize", { submit = true })
+      end,
+      mode = { "n", "x" },
+      desc = "OpenCode optimize",
+    },
+  },
+  config = function()
+    vim.g.opencode_opts = {
+      provider = {
+        snacks = {
+          win = {
+            position = "left",
+          },
+        },
+      },
+    }
+    vim.o.autoread = true
+  end,
+}