One access policy from content; onboarding into Kanidm as a form

Who may do what to what was five checks in five files: `qualifies` on
a page, `requires_group`/`public` on a resource, a desk's transition
allow-list, a self_transition's email check, the automation token.
They are now compiled from content on every load into one Cedar
policy set (src/access.rs), and every server entry point asks it: open
and submit a page, read a resource, move a record, fire a self
transition, read a bucket as the automation service, extend an
invite. Each decision names the rules that granted it; refusals and
every mutation are published on portal.access.decided, and
portal.access.<site>.may answers the same question for other apps
over request-reply (proven live against uhhm's content). The policy
validates against a fixed schema, so a content shape the compiler
cannot express fails instead of granting nothing. Identity is still
Kanidm's; the browser keeps is_qualified as a rendering hint only.

`invite: {group}` on an alternative of a gated page onboards a person:
src/people.rs creates the account, records the email, adds the group
and mints a one-time credential link through Kanidm's REST API with a
service-account token (KANIDM_API_TOKEN, in idm_people_on_boarding).
The result is recorded with the answer into the runtime's
portal_invites bucket and announced on portal.people.invited. Validated:
an invite needs a gated page and required name and email fields.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01L4jrCgLiKKHAEFuZUJjckH

src/content/validate.rs

@@ -48,6 +48,14 @@ aggregates:
     transitions:
       announced: [awaiting_summary, summarized]
       awaiting_summary: [summarized]
+  - bucket: portal_invites
+    attended_by: the inviting group's own desk, or the link in the invite event
+    initial: open
+    states:
+      open: { event: invited }
+      done: { event: done }
+    transitions:
+      open: [done]
 ";
 
 /// Adds the runtime's own state graphs to a content repo's. Content
@@ -145,6 +153,27 @@ pub fn validate_questions(
                     Some(_) => {}
                 }
             }
+            if let Some(invite) = &alternative.invite {
+                if question.qualifies.is_none() {
+                    anyhow::bail!(
+                        "question {:?} alternative {:?}: an invite into {:?} must sit on a page gated by `qualifies` - that group is who may extend it",
+                        question.id, alternative.name, invite.group
+                    );
+                }
+                let has = |name: &str| {
+                    alternative
+                        .features
+                        .iter()
+                        .flat_map(|f| &f.requirements)
+                        .any(|r| r.name == name && !r.optional)
+                };
+                if !has("name") || !has("email") {
+                    anyhow::bail!(
+                        "question {:?} alternative {:?}: an invite must collect required `name` and `email` fields",
+                        question.id, alternative.name
+                    );
+                }
+            }
             if let Some(st) = &alternative.self_transition {
                 if let Some(schema) = aggregates.get(&st.bucket) {
                     if !schema.has_state(&st.to) {