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

nvim-pack-lock.json

@@ -56,6 +56,10 @@
       "rev": "ba9c408fc0130fc4548760c3933a81b58fc50de8",
       "src": "https://github.com/chrishrb/gx.nvim"
     },
+    "haunt": {
+      "rev": "815141d7367c9d895e902db27e2d25d4652ad0fc",
+      "src": "https://github.com/TheNoeTrevino/haunt.nvim"
+    },
     "inc-rename": {
       "rev": "0074b551a17338ccdcd299bd86687cc651bcb33d",
       "src": "https://github.com/smjonas/inc-rename.nvim"
@@ -128,6 +132,10 @@
       "rev": "33198ba0533d6a514f9a48cb472e40407c2ea9f6",
       "src": "https://github.com/Apeiros-46B/qalc.nvim"
     },
+    "sidekick": {
+      "rev": "208e1c5b8170c01fd1d07df0139322a76479b235",
+      "src": "https://github.com/folke/sidekick.nvim"
+    },
     "snacks": {
       "rev": "ad9ede6a9cddf16cedbd31b8932d6dcdee9b716e",
       "src": "https://github.com/folke/snacks.nvim"