refactor(git): drop :Ghistory buffer in favor of :G! for full output

test/git/cmd_test.lua

@@ -610,30 +610,6 @@ t.test(
     end
 )
 
-t.test("streaming output buffer collects runs (failure path)", function()
-    make_repo({ a = "x" })
-    with_echo_stub(function(calls)
-        cmd.run({ "fetch", "nonexistent" })
-        t.wait_for(function()
-            return has_status(calls, "failed")
-        end, "failed progress notification", 5000)
-    end)
-    require("git.history").open()
-    local buf = vim.api.nvim_get_current_buf()
-    local lines = vim.api.nvim_buf_get_lines(buf, 0, -1, false)
-    local found_header, found_fatal = false, false
-    for _, l in ipairs(lines) do
-        if l:match("^%$ git fetch nonexistent$") then
-            found_header = true
-        end
-        if l:match("fatal:") then
-            found_fatal = true
-        end
-    end
-    t.truthy(found_header, "expected '$ git fetch nonexistent' header")
-    t.truthy(found_fatal, "expected fatal: line in output buffer")
-end)
-
 t.test(
     "streaming :G! fetch (bang) opens preview window with terminal buffer",
     function()