docs(examples): add the CMS proof-of-concept dogfooding artifact

A WordPress-inspired CMS whose entire backend is PiCloud Rhai scripts
deployed with pic apply, plus a SvelteKit frontend. Built to dogfood the
project tool, CLI, and SDK; exercises docs/kv/files/users, docs+queue+cron
+pubsub triggers, the transactional-outbox notification chain, a docs
before-interceptor, set_if CAS, SSE, per-app CORS, env overlays, and a
durable Workflow (validate -> enrich || seo -> publish -> finalize) started
with workflow::start and polled with workflow::run_status, visualized live
with Svelte Flow.

FINDINGS.md / SECURITY.md capture every gap, surprise, and security issue
found (each tagged [PiCloud] vs [CMS]); the platform fixes for the
actionable ones ship in the preceding commit.

Also folds in the read-only `pic` allowlist entries added to
.claude/settings.json during the session (fewer-permission-prompts).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

examples/cms-poc/scripts/pages/pages.rhai

@@ -0,0 +1,96 @@
+// pages — one script handling all page operations, dispatched by method+path.
+// Demonstrates a single script bound to several routes (method/param varies).
+//   GET    /cms/pages            -> public list (published)
+//   GET    /cms/pages/:slug      -> public get by slug
+//   GET    /cms/admin/pages      -> admin list (all)
+//   POST   /cms/admin/pages      -> create (admin)
+//   PUT    /cms/admin/pages/:id  -> update (admin)
+//   DELETE /cms/admin/pages/:id  -> delete (admin)
+import "auth" as auth;
+import "util" as util;
+
+let m = ctx.request.method;
+let path = ctx.request.path;
+let is_admin_path = path.contains("/cms/admin/");
+let pages = docs::collection("pages");
+let idx = kv::collection("slugs");
+
+// ---- public reads ----
+if !is_admin_path && m == "GET" && ctx.request.params.slug != () {
+    let id = idx.get("page:" + ctx.request.params.slug);
+    if id == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
+    let doc = pages.get(id);
+    if doc == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
+    let p = util::shape_doc(doc);
+    if p.status != "published" { return #{ statusCode: 404, body: #{ error: "not found" } }; }
+    return #{ statusCode: 200, body: p };
+}
+if !is_admin_path && m == "GET" {
+    let rows = pages.find(#{ status: "published", "$sort": #{ title: 1 }, "$limit": 100 });
+    let out = [];
+    for r in rows { let p = util::shape_doc(r); p.remove("body_md"); out.push(p); }
+    return #{ statusCode: 200, body: #{ pages: out } };
+}
+
+// ---- everything else is admin ----
+let g = auth::guard(ctx, ["admin"]);
+if !g.ok { return g.response; }
+let user = g.user;
+
+if m == "GET" {
+    let rows = pages.find(#{ "$sort": #{ updated_at: -1 }, "$limit": 100 });
+    let out = [];
+    for r in rows { let p = util::shape_doc(r); p.remove("body_md"); out.push(p); }
+    return #{ statusCode: 200, body: #{ pages: out } };
+}
+
+if m == "POST" {
+    let b = ctx.request.body;
+    if b == () || b.title == () { return #{ statusCode: 400, body: #{ error: "title required" } }; }
+    let slug = if b.slug == () { util::slugify(b.title) } else { util::slugify(b.slug) };
+    if idx.has("page:" + slug) { slug = slug + "-" + random::string(4).to_lower(); }
+    let data = #{
+        title: b.title,
+        slug: slug,
+        body_md: if b.body_md == () { "" } else { b.body_md },
+        status: if b.status == () { "draft" } else { b.status },
+        author_id: user.id,
+        author_name: user.display_name,
+    };
+    let id = pages.create(data);
+    idx.set("page:" + slug, id);
+    return #{ statusCode: 201, body: #{ id: id, slug: slug } };
+}
+
+if m == "PUT" {
+    let id = ctx.request.params.id;
+    let doc = pages.get(id);
+    if doc == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
+    let cur = doc.data;
+    let b = ctx.request.body;
+    if b.title != () { cur.title = b.title; }
+    if b.body_md != () { cur.body_md = b.body_md; }
+    if b.status != () { cur.status = b.status; }
+    if b.slug != () {
+        let ns = util::slugify(b.slug);
+        if ns != cur.slug {
+            idx.delete("page:" + cur.slug);
+            if idx.has("page:" + ns) { ns = ns + "-" + random::string(4).to_lower(); }
+            idx.set("page:" + ns, id);
+            cur.slug = ns;
+        }
+    }
+    pages.update(id, cur);
+    return #{ statusCode: 200, body: #{ id: id, slug: cur.slug } };
+}
+
+if m == "DELETE" {
+    let id = ctx.request.params.id;
+    let doc = pages.get(id);
+    if doc == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
+    pages.delete(id);
+    idx.delete("page:" + doc.data.slug);
+    return #{ statusCode: 200, body: #{ ok: true } };
+}
+
+#{ statusCode: 405, body: #{ error: "method not allowed" } }