[Sync] adopt unified stow layout from the private repo

Mirrors the private dots tree at 900bdda: one shared base plus per-host
overlays, replacing the old flat .config/ layout (last synced 2026-06-28).

- packages: common/ gui/ wm/ lw/ fl/ + install.sh and bin/ tooling (dotsync,
  reconcile-hyde.sh)
- new README (layout, deploy order, HyDE dependency), plus ToDo.md and
  HYDE-UPDATE.md
- current HyDE waybar rig (layouts/, cava), pi agent extensions, claude/
  config, tmux, presenterm, aichat roles
- drops stale duplicates and generated cruft that should never have been
  tracked: the second top-level .pi/ copy, btop.log, zellij config.kdl.bak,
  fish_variables, nvim codecompanion.lua
- .pi/agent/auth.json is gitignored now; auth.json.example ships instead
- fl/ and wm/ hypr themes/ stay untracked (HyDE-generated per machine, per
  the root .gitignore)

common/.config/nvim/lua/configs/lspconfig.lua

@@ -0,0 +1,28 @@
+require("nvchad.configs.lspconfig").defaults()
+
+local servers = { "html", "cssls", "ts_ls", "eslint" }
+vim.lsp.enable(servers)
+
+-- local lspconfig = require "lspconfig"
+-- local nvlsp = require "nvchad.configs.lspconfig"
+--
+-- -- lsps with default config
+-- for _, lsp in ipairs(servers) do
+--   lspconfig[lsp].setup {
+--     on_attach = nvlsp.on_attach,
+--     on_init = nvlsp.on_init,
+--     capabilities = nvlsp.capabilities,
+--   }
+-- end
+--
+-- -- configuring single server, example: typescript
+-- lspconfig.ts_ls.setup {
+--   filetypes = { 'typescript', 'javascript', 'javascriptreact', 'typescriptreact', 'vue', 'markdown' },
+-- }
+--
+-- -- configuring single server, example: typescript
+-- -- lspconfig.ts_ls.setup {
+-- --   on_attach = nvlsp.on_attach,
+-- --   on_init = nvlsp.on_init,
+-- --   capabilities = nvlsp.capabilities,
+-- -- }