feat: add sidekick.nvim and haunt.nvim with AI and bookmark integration

- Add sidekick.nvim: Next Edit Suggestions (NES) via Copilot LSP, integrated
  AI CLI terminal, and Snacks picker send action (<Alt-a>)
- Add haunt.nvim: in-buffer annotation/bookmark manager with Snacks picker
  and 6 keymaps (<leader>ha/ht/hd/hn/hp/hl)
- Wire blink.cmp <Tab> to chain snippet_forward -> NES -> inline completion
- Expose haunt_all and haunt_buffer as Sidekick prompt contexts
- Suppress lua_ls "Loading workspace" progress bar via Noice route
- Update README to document all new plugins, keymaps, and post-install steps

lua/keymaps.lua

@@ -331,3 +331,25 @@ end, { desc = "Restore Last Session" })
 vim.keymap.set("n", "<leader>qd", function()
 	require("persistence").stop()
 end, { desc = "Don't Save Current Session" })
+
+----------------------------------------------------------
+
+-- Haunt Keymaps
+vim.keymap.set("n", "<leader>ha", function()
+	require("haunt.api").annotate()
+end, { desc = "Annotate" })
+vim.keymap.set("n", "<leader>ht", function()
+	require("haunt.api").toggle_annotation()
+end, { desc = "Toggle Annotation" })
+vim.keymap.set("n", "<leader>hd", function()
+	require("haunt.api").delete()
+end, { desc = "Delete Bookmark" })
+vim.keymap.set("n", "<leader>hn", function()
+	require("haunt.api").next()
+end, { desc = "Next Bookmark" })
+vim.keymap.set("n", "<leader>hp", function()
+	require("haunt.api").prev()
+end, { desc = "Previous Bookmark" })
+vim.keymap.set("n", "<leader>hl", function()
+	require("haunt.picker").show()
+end, { desc = "Show Bookmark Picker" })