fix(booth): a partial ask answer is recorded, not refused

Operator: the form failed when a question was left blank. Refusing the whole
submission over one blank threw away the picks that were made, and the HTML
`required` on the radios blocked it in the browser before the server saw it.

- answered questions recorded; blank ones land in `unanswered`; `complete` says
  whether the set is finished; a blank question carrying a note keeps the note
- `required` dropped from both templates so the browser cannot block a partial
- refused only when there is no pick anywhere AND no notes (a 400 — that would
  flip an open ask to answered with no decision recorded); a choice outside the
  option list is still an error
- new ◐ partial state with an n/N count; skipped questions render as skipped
- README + global CLAUDE.md tell reading sessions to check `complete`
- 154 tests; v0.1.15

booth/templates/_asks.html

@@ -8,11 +8,12 @@
      collapsed "change" form, since the sidecar is the CURRENT answer. #}
   <section class="asks">
   {% for a in asks %}
-    <article class="ask{% if a.answer %} is-answered{% elif a.error %} is-broken{% endif %}" id="ask-{{ a.stem }}">
+    <article class="ask{% if a.answer and a.answer.complete %} is-answered{% elif a.answer %} is-partial{% elif a.error %} is-broken{% endif %}" id="ask-{{ a.stem }}">
       <header class="ask-head">
-        <span class="ask-state">{% if a.error %}⚠ broken{% elif a.answer %}✓ answered{% else %}? open{% endif %}</span>
+        <span class="ask-state">{% if a.error %}⚠ broken{% elif a.answer and a.answer.complete %}✓ answered{% elif a.answer %}◐ partial{% else %}? open{% endif %}</span>
         <span class="ask-stem"><code>{{ a.stem }}.ask.json</code>{% if a.multi %} · {{ a.questions|length }} questions{% endif %}</span>
         <span class="board-spacer"></span>
+        {% if a.answer and not a.answer.complete %}<span class="ask-part">{{ (a.questions|length) - (a.answer.unanswered|length) }}/{{ a.questions|length }}</span>{% endif %}
         {% if a.answer %}<span class="ask-when">{{ a.answer.answered_at }}{% if a.answer.answered_by %} · {{ a.answer.answered_by }}{% endif %}</span>{% endif %}
       </header>
       {% if a.error %}
@@ -26,7 +27,7 @@
               {% for q in a.questions %}{% set qa = a.answer.answers.get(q.key) %}
               <div class="ask-answer-q">
                 <span class="ask-answer-qprompt">{{ q.prompt }}</span>
-                <div class="ask-answer-choice">{{ qa.label if qa else '—' }}</div>
+                <div class="ask-answer-choice{% if not (qa and qa.choice is not none) %} is-skipped{% endif %}">{{ qa.label if (qa and qa.choice is not none) else 'left blank' }}</div>
                 {% if qa and qa.notes %}<pre class="ask-answer-notes">{{ qa.notes }}</pre>{% endif %}
               </div>
               {% endfor %}
@@ -52,7 +53,7 @@
               <div class="ask-options">
               {% for o in q.options %}
                 <label class="ask-opt{% if qa and qa.choice == o.id %} is-current{% endif %}">
-                  <input type="radio" name="{{ field }}" value="{{ o.id }}" required
+                  <input type="radio" name="{{ field }}" value="{{ o.id }}"
                          {% if qa and qa.choice == o.id %}checked{% endif %}>
                   <span class="ask-opt-main">
                     <span class="ask-opt-label">{{ o.label }}</span>