Rewrite README.md for improved clarity, structure, and usability; add development history to LEGACY.md.

LEGACY.md

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+Legacy Development History
+---
+The source code of open-gsio was drawn from the source code of my personal website. That commit history was contaminated early on with secrets. `open-gsio` is a refinement of those sources. A total of 367 commits were submitted to the main branch of the upstream source repository between August 2024 and May 2025.
+
+#### **May 2025**
+
+* Added **seemueller.ai** link to UI sidebar.
+* Global config/markdown guide clean‑up; patched a critical forgotten bug.
+
+#### **Apr 2025**
+
+* **CI/CD overhaul**: auto‑deploy to dev & staging, Bun adoption as package manager, streamlined block‑list workflow (now auto‑updates via VPN blocker).
+* New 404 error page; multiple robots.txt and editor‑resize fixes; removed dead/duplicate code.
+
+#### **Mar 2025**
+
+* Introduced **model‑specific `max_tokens`** handling and plugged in **Cloudflare AI models** for testing.
+* Bundle size minimised (re‑enabled minifier, smaller vendor set).
+
+#### **Feb 2025**
+
+* **Full theme system** (runtime switching, Centauri theme, server‑saved prefs).
+* Tightened MobX typing for messages; responsive break‑points & input scaling repaired.
+* Dropped legacy document API; general folder restructure.
+
+#### **Jan 2025**
+
+* **Rate‑limit middleware**, larger KV/R2 storage quota.
+* Switched default model → *llama‑v3p1‑70b‑instruct*; pluggable model handlers.
+* Added **KaTeX fonts** & **Marked.js** for rich math/markdown.
+* Fireworks key rotation; deprecated Google models removed.
+
+#### **Dec 2024**
+
+* Major package upgrades; **CodeHighlighter** now supports HTML/JSX/TS(X)/Zig.
+* Refactored streaming + markdown renderer; Android‑specific padding fixes.
+* Reset default chat model to **gpt‑4o**; welcome message & richer search‑intent logic.
+
+#### **Nov 2024**
+
+* **Fireworks API** + agent server; first‑class support for **Anthropic** & **GROQ** models (incl. attachments).
+* **VPN blocker** shipped with CIDR validation and dedicated GitHub Action.
+* Live search buffering, feedback modal, smarter context preprocessing.
+
+#### **Oct 2024**
+
+* Rolled out **image generation** + picker for image models.
+* Deployed **ETH payment processor** & deposit‑address flow.
+* Introduced few‑shot prompting library; analytics worker refactor; Halloween prompt.
+* Extensive mobile‑UX polish and bundling/worker config updates.
+
+#### **Sep 2024**
+
+* End‑to‑end **math rendering** (KaTeX) and **GitHub‑flavoured markdown**.
+* Migrated chat state to **MobX**; launched analytics service & metrics worker.
+* Switched build minifier to **esbuild**; tokenizer limits enforced; gradient sidebar & cookie‑consent manager added.
+
+#### **Aug 2024**
+
+* **Initial MVP**: iMessage‑style chat UI, websocket prototype, Google Analytics, Cloudflare bindings, base worker‑site scaffold.