Fix WebMCP schema validity on contact form (#13)

## Summary

Follow-up to PR #12 / Lighthouse agentic-browsing audit on `/contact` (score 0.88).

- Add `toolparamdescription` to all contact form fields for WebMCP schema validity
- Move reCAPTCHA outside the annotated `<form>` so `g-recaptcha-response` is excluded from the declarative tool schema
- Always render `toolname` / `tooldescription` on the contact form (not gated by `WEBMCP_ENABLED`)
- Override `django_recaptcha/widget_v3.html` to associate captcha with `form="contact-form"`
- Update docs with HTTPS Lighthouse commands

## Test plan

- [x] `python manage.py test public.tests` — 21 tests pass
- [ ] Deploy and re-run Lighthouse agentic-browsing on `https://aimloperations.com/contact`
- [ ] Confirm `webmcp-schema-validity` passes (expected overall score 1.0)

Reviewed-on: #13

company_site/public/templates/django_recaptcha/widget_v3.html

@@ -0,0 +1,8 @@
+{% include "django_recaptcha/includes/js_v3.html" %}
+<input
+    type="hidden"
+    name="{{ widget.name }}"
+    class="g-recaptcha"
+    form="contact-form"
+    {% for name, value in widget.attrs.items %}{% if value is not False %} {{ name }}{% if value is not True %}="{{ value|stringformat:'s' }}"{% endif %}{% endif %}{% endfor %}
+>

company_site/public/templates/public/contact.html

@@ -33,41 +33,53 @@
 
         <div class="card">
           <h2 class="card-title contact-form-heading" id="contact-form-heading" style="margin-bottom: 2rem;">Send Us a Message</h2>
-          <form action="{% url 'contact' %}" method="POST" aria-labelledby="contact-form-heading"
-            {% if webmcp_enabled %}toolname="submit_contact_inquiry" tooldescription="Submit a contact inquiry to AI ML Operations"{% endif %}>
+          <form id="contact-form" action="{% url 'contact' %}" method="POST" aria-labelledby="contact-form-heading"
+            toolname="submit_contact_inquiry"
+            tooldescription="Submit a contact inquiry to AI ML Operations">
             {% csrf_token %}
             <div class="form-row">
               <div class="form-group">
                 <label class="form-label" for="contact-name">Your Name</label>
-                <input type="text" class="form-control" name="name" id="contact-name" autocomplete="name" required>
+                <input type="text" class="form-control" name="name" id="contact-name" autocomplete="name" required
+                  toolparamdescription="Full name of the person submitting the inquiry.">
               </div>
               <div class="form-group">
                 <label class="form-label" for="contact-email">Your Email</label>
-                <input type="email" class="form-control" name="email" id="contact-email" autocomplete="email" required>
+                <input type="email" class="form-control" name="email" id="contact-email" autocomplete="email" required
+                  toolparamdescription="Email address where AI ML Operations can reply.">
               </div>
             </div>
 
             <div class="form-group">
               <label class="form-label" for="contact-subject">Subject</label>
-              <input type="text" class="form-control" name="subject" id="contact-subject" value="{{ request.GET.subject|default:'' }}" required>
+              <input type="text" class="form-control" name="subject" id="contact-subject" value="{{ request.GET.subject|default:'' }}" required
+                toolparamdescription="Short summary of the inquiry topic or service of interest.">
             </div>
 
             <div class="form-group">
               <label class="form-label" for="contact-message">Message</label>
-              <textarea name="message" class="form-control" id="contact-message" rows="5" placeholder="What workflow is costing you the most time? What systems does it touch?"></textarea>
-            </div>
-
-            <div class="form-group">
-              {% if capchaForm %}
-              {{ capchaForm }}
-              {% endif %}
+              <textarea name="message" class="form-control" id="contact-message" rows="5"
+                placeholder="What workflow is costing you the most time? What systems does it touch?"
+                toolparamdescription="Optional details about the workflow, bottleneck, or systems involved."></textarea>
             </div>
 
+            {% if not capchaForm %}
             <button class="btn" type="submit"
               data-tianji-event="contact_form_submit">
               Send Message
             </button>
+            {% endif %}
           </form>
+
+          {% if capchaForm %}
+          <div class="form-group contact-captcha-group">
+            {{ capchaForm }}
+          </div>
+          <button class="btn" type="submit" form="contact-form"
+            data-tianji-event="contact_form_submit">
+            Send Message
+          </button>
+          {% endif %}
         </div>
       </div>