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/posts/post_delete.rhai

@@ -0,0 +1,13 @@
+// DELETE /cms/admin/posts/:id — delete a post (admin only).
+import "auth" as auth;
+let g = auth::guard(ctx, ["admin"]);
+if !g.ok { return g.response; }
+
+let id = ctx.request.params.id;
+let posts = docs::collection("posts");
+let doc = posts.get(id);
+if doc == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
+let slug = doc.data.slug;
+posts.delete(id);
+kv::collection("slugs").delete("post:" + slug);
+#{ statusCode: 200, body: #{ ok: true } }