feat(plugins): add codediff, tv, vellum plugins and drop overseer support

lua/plugins/tv.lua

@@ -0,0 +1,45 @@
+--- tv.nvim: television channels in a floating terminal
+--- <C-t> picks from the file/editor cable channels in the dotfiles
+--- (~/.config/television/cable) only. Their cable `enter` actions would spawn
+--- an editor inside the float, so each gets Neovim-side handlers: tv.nvim
+--- passes handler keys as `--expect`, which wins over cable keybindings.
+--- `:Tv <channel>` still reaches any channel.
+--- @module plugins.tv
+
+local OPEN = { "files", "git-files", "recent-files", "dotfiles", "git-diff" }
+local GREP = { "text", "todo-comments" }
+
+---@type LazySpec
+return {
+  "alexpasmantier/tv.nvim",
+  cmd = "Tv",
+  keys = {
+    {
+      "<C-t>",
+      function()
+        vim.ui.select(vim.list_extend(vim.list_extend({}, OPEN), GREP), { prompt = "Television" }, function(choice)
+          if choice then require("tv").tv_channel(choice) end
+        end)
+      end,
+      desc = "Television file channels",
+    },
+  },
+  config = function()
+    local h = require("tv").handlers
+    local channels = {}
+    -- no <C-s>/<C-x>: tv uses them for cycle_sources / the action picker
+    for _, name in ipairs(OPEN) do
+      channels[name] = {
+        handlers = { ["<CR>"] = h.open_as_files, ["<C-q>"] = h.send_to_quickfix, ["<C-v>"] = h.open_in_vsplit },
+      }
+    end
+    for _, name in ipairs(GREP) do
+      channels[name] = { handlers = { ["<CR>"] = h.open_at_line, ["<C-q>"] = h.send_to_quickfix } }
+    end
+
+    require("tv").setup {
+      global_keybindings = { channels = false }, -- <C-t> lives in `keys` above
+      channels = channels,
+    }
+  end,
+}