[Sync] replace the flat layout with the unified stow tree

Supersedes the old flat .config/ layout (last published 2026-06-28) with the
private repo's structure: one shared base plus per-host overlays.

- packages: common/ gui/ lw/ fl/ wm/ plus install.sh and bin/ tooling
  (dotsync, reconcile-hyde.sh)
- new README covering the layout, deploy order and the HyDE dependency
- current HyDE waybar rig (layouts/, cava), pi agent extensions, claude/
  config, tmux, presenterm, aichat roles
- fish: kp (keepassxc-cli + fzf picker, db path from $KP_DB) and
  bind_M_n_history (alt+1..9 recalls the nth history entry)
- drops cruft that should never have been tracked: the duplicate top-level
  .pi/ copy, btop.log, zellij config.kdl.bak, fish_variables
- .pi/agent/auth.json is gitignored; auth.json.example ships instead

Host-specific work sessions and the personal backlog stay in the private
tree. Endpoint locators in the llamacpp/whisper guides are placeholders
($SERVER, <own-domain>) — the guides themselves stay, since they are the
useful part.

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,
+-- -- }