docs: add brand artwork (icon + promo banner + vertical) and hero image

- assets/icon.png — square logo, Rosetta-stone tablet metaphor
- assets/promo.png — 1.91:1 banner for GitHub social preview / Twitter card
- assets/promo-vertical.png — 4:5 portrait for Instagram / Xiaohongshu
- README hero image inserted under the title
- gitignore CLAUDE.md (local agent guide) and figures/ai_generated/
  (intermediate output dir from image2 skill)

Author: SyntaxSmith

.gitignore

@@ -10,3 +10,9 @@ coverage/
 # scratch / debug helpers (keep local)
 scripts/_*.mjs
 scripts/_*.ts
+
+# Claude Code agent guide (kept local)
+CLAUDE.md
+
+# image2 skill scratch outputs
+figures/ai_generated/

README.md

@@ -1,5 +1,9 @@
 # rosetta
 
+<p align="center">
+  <img src="assets/promo.png" alt="rosetta — Pro web protocol ⇌ Node API" width="720">
+</p>
+
 Programmatic access to **ChatGPT (incl. Pro)** from Node, by translating between an auth-holder Chrome page and a clean API. 
 
 > Like the Rosetta Stone: the Pro web protocol on one side, a regular Node API on the other.
@@ -295,6 +299,16 @@ Run `pnpm build` in the rosetta repo first so `dist/` exists.
 - Soft-delete on cleanup keeps the conversation list clean; persisted recall threads opt out of soft-delete automatically.
 - Not affiliated with OpenAI. Use respectfully and within your account's terms of service.
 
+## Acknowledgments
+
+rosetta descends from **[oracle](https://github.com/steipete/oracle)** — the
+predecessor that pioneered the auth-holder Chrome / CDP-orchestrator pattern
+this library extends to Pro thinking. The cross-platform `~/.rosetta/` profile
+convention, the `httpRequestViaChrome` shim that side-steps Cloudflare TLS
+fingerprinting, and the conversation soft-delete dance are all lifted directly
+from oracle's playbook. Thanks to that project for figuring out the hard parts
+first.
+
 ## License
 
 MIT