Add Omarchy integration: theme catalog hot-reload + OSC52 clipboard

Intrepid now installs Omarchy's full colorscheme catalog and hot-reloads
by reading the theme spec omarchy-theme-set writes to
~/.local/state/omarchy/current/theme/neovim.lua, watched via vim.uv
(no lazy.nvim here, so this replicates its file-watch + reload behavior
directly). Other hosts are unaffected.

Also ports Omarchy's OSC52 remote-clipboard module so yanks still reach
the local Wayland clipboard/tmux/SSH client, matching the default
Omarchy nvim config's behavior in those sessions.

lua/omarchy_theme.lua

@@ -0,0 +1,109 @@
+-- Full Omarchy theme-catalog hot-reload, for hosts that want Neovim to track
+-- the system theme (`omarchy-theme-set`) instead of a fixed colorscheme.
+--
+-- Omarchy's default LazyVim config gets this for free from lazy.nvim's file
+-- watcher + a symlinked plugin spec (lua/plugins/theme.lua ->
+-- ~/.local/state/omarchy/current/theme/neovim.lua). This config doesn't run
+-- lazy.nvim, so instead: read that same generated spec file directly (it's
+-- the authoritative theme-name -> colorscheme mapping Omarchy maintains) and
+-- watch the state directory ourselves with vim.uv.
+local M = {}
+
+local state_dir = vim.fn.expand("~/.local/state/omarchy/current")
+local theme_spec_file = state_dir .. "/theme/neovim.lua"
+
+local transparent_groups = {
+	"Normal", "NormalFloat", "FloatBorder", "Pmenu", "Terminal", "EndOfBuffer",
+	"FoldColumn", "Folded", "SignColumn", "LineNr", "CursorLineNr", "NormalNC",
+	"WhichKeyFloat", "TelescopeBorder", "TelescopeNormal", "TelescopePromptBorder",
+	"TelescopePromptTitle", "NvimTreeNormal", "NvimTreeVertSplit", "NvimTreeEndOfBuffer",
+	"NotifyINFOBody", "NotifyERRORBody", "NotifyWARNBody", "NotifyTRACEBody", "NotifyDEBUGBody",
+	"NotifyINFOTitle", "NotifyERRORTitle", "NotifyWARNTitle", "NotifyTRACETitle", "NotifyDEBUGTitle",
+	"NotifyINFOBorder", "NotifyERRORBorder", "NotifyWARNBorder", "NotifyTRACEBorder", "NotifyDEBUGBorder",
+}
+
+local function apply_transparency()
+	for _, name in ipairs(transparent_groups) do
+		local ok, hl = pcall(vim.api.nvim_get_hl, 0, { name = name, link = false })
+		if ok then
+			hl.bg = nil
+			vim.api.nvim_set_hl(0, name, hl)
+		end
+	end
+end
+
+-- Pull the colorscheme name out of Omarchy's generated theme spec, e.g.:
+--   return {
+--     { "folke/tokyonight.nvim", priority = 1000 },
+--     { "LazyVim/LazyVim", opts = { colorscheme = "tokyonight-night" } },
+--   }
+local function read_colorscheme()
+	local chunk, err = loadfile(theme_spec_file)
+	if not chunk then
+		vim.notify("omarchy_theme: " .. tostring(err), vim.log.levels.WARN)
+		return nil
+	end
+
+	local ok, spec = pcall(chunk)
+	if not ok or type(spec) ~= "table" then
+		return nil
+	end
+
+	for _, entry in ipairs(spec) do
+		if entry[1] == "LazyVim/LazyVim" and entry.opts and entry.opts.colorscheme then
+			return entry.opts.colorscheme
+		end
+	end
+end
+
+function M.reload()
+	local colorscheme = read_colorscheme()
+	if not colorscheme then
+		return
+	end
+
+	vim.o.background = "dark"
+	vim.cmd("highlight clear")
+	if vim.fn.exists("syntax_on") == 1 then
+		vim.cmd("syntax reset")
+	end
+
+	if not pcall(vim.cmd.colorscheme, colorscheme) then
+		vim.notify("omarchy_theme: colorscheme '" .. colorscheme .. "' not found", vim.log.levels.WARN)
+		return
+	end
+
+	apply_transparency()
+	vim.cmd("redraw!")
+end
+
+local watching = false
+
+-- `omarchy-theme-set` swaps the whole `current/theme` directory (rm -rf +
+-- mv), so re-arm the watch after every fire or it goes stale once the old
+-- inode is gone.
+local function watch()
+	if watching then
+		return
+	end
+	watching = true
+
+	local handle = vim.uv.new_fs_event()
+	local function start()
+		handle:start(state_dir, {}, vim.schedule_wrap(function()
+			handle:stop()
+			vim.defer_fn(function()
+				M.reload()
+				start()
+			end, 150)
+		end))
+	end
+	start()
+end
+
+function M.setup()
+	M.reload()
+	watch()
+end
+
+return M