Fix keymap and plugin spec bugs

- Move fugitive force-push from <leader>gf to <leader>gF; <leader>gf is
  LazyVim's read-only "Git Current File History"
- octo.nvim used `opt` instead of `opts`, so the PR comment mappings were
  silently dropped; also drop the spec duplicated by the util.octo extra
- oil's `-` keymap had `desc` nested in a third table, so lazy.nvim ignored it

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

lua/plugins/oil.lua

@@ -25,6 +25,6 @@ return {
   },
   dependencies = { "nvim-tree/nvim-web-devicons" },
   keys = {
-    { "-", "<cmd>Oil<cr>", { desc = "Open parent directory in current buffer" } },
+    { "-", "<cmd>Oil<cr>", desc = "Open parent directory in current buffer" },
   },
 }