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/workflow/wf_enrich.rhai

@@ -0,0 +1,24 @@
+// workflow step: enrich — auto-generate an excerpt (if missing) and a reading
+// time, and write them back onto the post. Runs in PARALLEL with `seo`.
+let b = ctx.request.body;
+let posts = docs::collection("posts");
+let post = posts.get(b.post_id);
+let d = post.data;
+let body = if d.body_md == () { "" } else { d.body_md };
+let words = if body == "" { 0 } else { body.split(" ").len() };
+let reading_time = (words / 200) + 1;
+
+let excerpt = d.excerpt;
+if excerpt == () || excerpt == "" {
+    let parts = body.split(" ");
+    let n = if parts.len() < 24 { parts.len() } else { 24 };
+    let ex = "";
+    for i in 0..n { ex += parts[i] + " "; }
+    ex.trim();
+    excerpt = ex + "…";
+    d.excerpt = excerpt;
+}
+d.reading_time = reading_time;
+posts.update(b.post_id, d);
+
+#{ excerpt: excerpt, reading_time: reading_time }