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_validate.rhai

@@ -0,0 +1,14 @@
+// workflow step: validate — check the post has a title + enough body.
+// Output { ok, word_count, issues } → gates the rest of the DAG via `when`.
+let b = ctx.request.body;
+let post = docs::collection("posts").get(b.post_id);
+if post == () {
+    return #{ ok: false, issues: ["post not found"], word_count: 0 };
+}
+let d = post.data;
+let issues = [];
+if d.title == () || d.title == "" { issues.push("missing title"); }
+let body = if d.body_md == () { "" } else { d.body_md };
+let words = if body == "" { 0 } else { body.split(" ").len() };
+if words < 3 { issues.push("body too short"); }
+#{ ok: issues.len() == 0, word_count: words, issues: issues }