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_get.rhai

@@ -0,0 +1,24 @@
+// GET /cms/posts/:slug — public single published post (by slug).
+// Resolves slug -> id via the kv slug index, increments a CAS view counter.
+import "util" as util;
+let slug = ctx.request.params.slug;
+if slug == () { return #{ statusCode: 400, body: #{ error: "missing slug" } }; }
+
+let idx = kv::collection("slugs");
+let id = idx.get("post:" + slug);
+if id == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
+
+let posts = docs::collection("posts");
+let doc = posts.get(id);
+if doc == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
+
+let p = util::shape_doc(doc);
+// A public reader may only see PUBLISHED posts — never a draft/scheduled one,
+// even if they guess the slug. (No platform per-row authz; enforced here.)
+if p.status != "published" {
+    return #{ statusCode: 404, body: #{ error: "not found" } };
+}
+
+let views = util::incr("views", "post:" + id);
+p.views = views;
+#{ statusCode: 200, body: p }