fix(submitter): submit_batch/2 crashed on every call (MatchError)

handle_call({:submit_batch, ...}) matched the inner
handle_call({:submit, ...}) against a bare {:ok, id, result}, but that
call returns a GenServer {:reply, {:ok, id, result}, state} 3-tuple — so
submit_batch/2 raised MatchError for any non-empty issue list, taking down
the Submitter GenServer. Destructure the reply payload instead.

The pre-existing test 'submit_batch/2 batch submission processes multiple
issues' now passes; full suite green (139 tests, 0 failures).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: hyperpolymath

elixir-mcp/lib/feedback_a_tron/submitter.ex

@@ -119,7 +119,9 @@ defmodule FeedbackATron.Submitter do
   @impl true
   def handle_call({:submit_batch, issues, opts}, _from, state) do
     results = Enum.map(issues, fn issue ->
-      {:ok, id, result} = handle_call({:submit, issue, opts}, nil, state)
+      # handle_call({:submit, ...}) returns a GenServer {:reply, payload, state}
+      # 3-tuple; destructure the reply payload, not a bare {:ok, id, result}.
+      {:reply, {:ok, id, result}, _new_state} = handle_call({:submit, issue, opts}, nil, state)
       {id, result}
     end)
     {:reply, {:ok, results}, state}