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/media/media_get.rhai

@@ -0,0 +1,18 @@
+// GET /cms/media/:id — serve the image as REAL binary bytes (public).
+// Since the platform fix (F-026), a response with a `body_base64` field returns
+// raw bytes with a script-set Content-Type, so <img src="/cms/media/:id"> works
+// directly (no more base64 data-URL workaround).
+let id = ctx.request.params.id;
+let media = files::collection("media");
+let meta = media.head(id);
+if meta == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
+let bytes = media.get(id);
+if bytes == () { return #{ statusCode: 404, body: #{ error: "not found" } }; }
+#{
+    statusCode: 200,
+    headers: #{
+        "content-type": meta.content_type,
+        "cache-control": "public, max-age=3600",
+    },
+    body_base64: base64::encode(bytes),
+}