feat: migrate from lazy.nvim to vim.pack

Replace lazy.nvim plugin manager with Neovim 0.12's native vim.pack API.
All plugin config files rewritten from lazy.nvim spec tables to imperative
require/setup format with explicit vim.keymap.set() calls.

Key changes:
- vim.pack.add() with ~53 plugins in init.lua
- blink.cmp/pairs/download pinned to version tags (vim.version.range)
- PackChanged autocmd for markdown-preview build hook
- Ordered requires: colorscheme → ui → treesitter → completion → lsp → rest
- Plugin setup guards (gitsigns, which-key, blink.cmp) handle deferred
  plugin/ file loading correctly

Net reduction: ~438 lines across 13 files.

1 files changed, 76 insertions, 146 deletions

diff --git a/home/.config/nvim/lua/plugins/runner.lua b/home/.config/nvim/lua/plugins/runner.lua
index 229d68d..28e4e5f 100644
--- a/home/.config/nvim/lua/plugins/runner.lua
+++ b/home/.config/nvim/lua/plugins/runner.lua
@@ -1,147 +1,77 @@
-return {
-  {
-    "stevearc/overseer.nvim",
-    keys = {
-      {
-        "<leader>to",
-        function()
-          require("overseer").toggle()
-        end,
-        desc = "[T]oggle [O]verseer",
-      },
-      {
-        "<leader>ob",
-        function()
-          require("overseer").run_task({
-            name = "just build",
-            disallow_prompt = true,
-          })
-        end,
-        desc = "[O]verseer [B]uild",
-      },
-      {
-        "<leader>oB",
-        function()
-          require("overseer").run_task({
-            name = "just build",
-          })
-        end,
-        desc = "[O]verseer [B]uild",
-      },
-      {
-        "<leader>ot",
-        function()
-          require("overseer").run_task({
-            name = "just test",
-            disallow_prompt = true,
-          })
-        end,
-        desc = "[O]verseer [J]ust [T]est",
-      },
-      {
-        "<leader>oT",
-        function()
-          require("overseer").run_task({
-            name = "just test",
-          })
-        end,
-        desc = "[O]verseer [J]ust [T]est",
-      },
-      {
-        "<leader>of",
-        function()
-          require("overseer").run_task({
-            name = "just test",
-            disallow_prompt = true,
-            params = { target = vim.fn.expand("%") },
-          })
-        end,
-        desc = "[O]verseer test [F]ile",
-      },
-      {
-        "<leader>oF",
-        function()
-          require("overseer").run_task({
-            name = "just test",
-            params = { target = vim.fn.expand("%") },
-          })
-        end,
-        desc = "[O]verseer test [F]ile",
-      },
-      {
-        "<leader>od",
-        function()
-          require("overseer").run_task({
-            name = "just debug=true test",
-            disallow_prompt = true,
-            params = { target = vim.fn.expand("%") },
-          })
-        end,
-        desc = "[O]verseer [d]ebug test file",
-      },
-      {
-        "<leader>oD",
-        function()
-          require("overseer").run_task({
-            name = "just debug=true test",
-            params = { target = vim.fn.expand("%") },
-          })
-        end,
-        desc = "[O]verseer [D]ebug test file",
-      },
-      {
-        "<leader>oa",
-        function()
-          require("overseer").run_task({
-            name = "just test_autofix",
-            disallow_prompt = true,
-            params = { target = vim.fn.expand("%") },
-          })
-        end,
-        desc = "[O]verseer [A]utofix",
-      },
-      {
-        "<leader>or",
-        function()
-          require("overseer").run_task()
-        end,
-        desc = "[O]verseer [R]un",
-      },
-      {
-        "<leader>os",
-        function()
-          vim.cmd("OverseerShell")
-        end,
-        desc = "[O]verseer [S]hell",
-      },
-      {
-        "<leader>ol",
-        function()
-          local tasks = require("overseer").list_tasks({
-            sort = function(a, b)
-              return a.id > b.id
-            end,
-          })
-          if vim.tbl_isempty(tasks) then
-            vim.notify("No tasks found", vim.log.levels.WARN)
-          else
-            require("overseer").run_action(tasks[1], "restart")
-          end
-        end,
-        desc = "[O]verseer run [L]ast",
-      },
-    },
-    config = function()
-      local overseer = require("overseer")
-      overseer.setup({})
-      overseer.add_template_hook({ name = ".*" }, function(task_defn, util)
-        util.add_component(task_defn, {
-          "open_output",
-          on_start = "never",
-          on_complete = "failure",
-          direction = "vertical",
-        })
-      end)
+local overseer = require("overseer")
+overseer.setup({})
+overseer.add_template_hook({ name = ".*" }, function(task_defn, util)
+  util.add_component(task_defn, {
+    "open_output",
+    on_start = "never",
+    on_complete = "failure",
+    direction = "vertical",
+  })
+end)
+
+vim.keymap.set("n", "<leader>to", function()
+  overseer.toggle()
+end, { desc = "[T]oggle [O]verseer" })
+vim.keymap.set("n", "<leader>ob", function()
+  overseer.run_task({ name = "just build", disallow_prompt = true })
+end, { desc = "[O]verseer [B]uild" })
+vim.keymap.set("n", "<leader>oB", function()
+  overseer.run_task({ name = "just build" })
+end, { desc = "[O]verseer [B]uild" })
+vim.keymap.set("n", "<leader>ot", function()
+  overseer.run_task({ name = "just test", disallow_prompt = true })
+end, { desc = "[O]verseer [J]ust [T]est" })
+vim.keymap.set("n", "<leader>oT", function()
+  overseer.run_task({ name = "just test" })
+end, { desc = "[O]verseer [J]ust [T]est" })
+vim.keymap.set("n", "<leader>of", function()
+  overseer.run_task({
+    name = "just test",
+    disallow_prompt = true,
+    params = { target = vim.fn.expand("%") },
+  })
+end, { desc = "[O]verseer test [F]ile" })
+vim.keymap.set("n", "<leader>oF", function()
+  overseer.run_task({
+    name = "just test",
+    params = { target = vim.fn.expand("%") },
+  })
+end, { desc = "[O]verseer test [F]ile" })
+vim.keymap.set("n", "<leader>od", function()
+  overseer.run_task({
+    name = "just debug=true test",
+    disallow_prompt = true,
+    params = { target = vim.fn.expand("%") },
+  })
+end, { desc = "[O]verseer [d]ebug test file" })
+vim.keymap.set("n", "<leader>oD", function()
+  overseer.run_task({
+    name = "just debug=true test",
+    params = { target = vim.fn.expand("%") },
+  })
+end, { desc = "[O]verseer [D]ebug test file" })
+vim.keymap.set("n", "<leader>oa", function()
+  overseer.run_task({
+    name = "just test_autofix",
+    disallow_prompt = true,
+    params = { target = vim.fn.expand("%") },
+  })
+end, { desc = "[O]verseer [A]utofix" })
+vim.keymap.set("n", "<leader>or", function()
+  overseer.run_task()
+end, { desc = "[O]verseer [R]un" })
+vim.keymap.set("n", "<leader>os", function()
+  vim.cmd("OverseerShell")
+end, { desc = "[O]verseer [S]hell" })
+vim.keymap.set("n", "<leader>ol", function()
+  local tasks = overseer.list_tasks({
+    sort = function(a, b)
+      return a.id > b.id
     end,
-  },
-}
+  })
+  if vim.tbl_isempty(tasks) then
+    vim.notify("No tasks found", vim.log.levels.WARN)
+  else
+    overseer.run_action(tasks[1], "restart")
+  end
+end, { desc = "[O]verseer run [L]ast" })