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/gitea.rs

@@ -190,6 +190,7 @@ pub async fn watch_for_reload(
         arc_swap::ArcSwap<std::collections::HashMap<String, crate::aggregates::AggregateSchema>>,
     >,
     site: std::sync::Arc<arc_swap::ArcSwap<SiteConfig>>,
+    access: std::sync::Arc<arc_swap::ArcSwap<crate::access::Policy>>,
 ) {
     let mut sub = match nats.subscribe(CONTENT_RELOAD_SUBJECT).await {
         Ok(sub) => sub,
@@ -225,6 +226,9 @@ pub async fn watch_for_reload(
                     continue;
                 }
                 let count = loaded.len();
+                // The policy is compiled from the content it gates, so
+                // it swaps in the same breath.
+                access.store(std::sync::Arc::new(crate::access::Policy::from_content(&loaded, &loaded_aggregates)));
                 questions.store(std::sync::Arc::new(loaded));
                 aggregates.store(std::sync::Arc::new(loaded_aggregates));
                 site.store(std::sync::Arc::new(loaded_site));