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/fugitive.lua

@@ -14,7 +14,7 @@ return {
     { "<leader>gc", [[<Cmd>Git commit<CR>]], desc = "[G]it [C]ommit" },
     { "<leader>gb", [[<Cmd>Git blame -C<CR>]], desc = "[G]it [B]lame" },
     { "<leader>gp", [[<Cmd>Git push<CR>]], desc = "[G]it [P]ush" },
-    { "<leader>gf", [[<Cmd>Git push --force<CR>]], desc = "[G]it [F]orce push" },
+    { "<leader>gF", [[<Cmd>Git push --force<CR>]], desc = "[G]it [F]orce push" },
     { "<leader>gu", [[<Cmd>Git pull<CR>]], desc = "[G]it p[U]ll" },
     {
       "<leader>gh",