Rewrite README to reflect the PlotFlow brand (#2)

Lead with what PlotFlow is (pen-plotter art house, one-continuous-line
mobile suit editions) and the process, while keeping the local-run,
deploy, and structure notes.

https://claude.ai/code/session_01VhWRYXbuqapZ9YkvksroaS

Co-authored-by: Claude <noreply@anthropic.com>

Author: ddyson1

README.md

@@ -1,17 +1,46 @@
-# PLOTFLOW — plotflow.io
+# PLOTFLOW
 
-Static website for PlotFlow, an avant-garde pen-plotter art house. No build step, no framework — plain HTML/CSS/JS served via GitHub Pages.
+**Avant-garde pen-plotter art house.** Universal-Century mobile suits, rebuilt as a single unbroken line and drawn in ink by machine.
+
+一筆書き — *hitofudegaki*, "one continuous line."
+
+🌐 **[plotflow.io](https://plotflow.io)**
+
+---
+
+## What it is
+
+PlotFlow reimagines each mobile suit as one continuous vector path — no pen lifts, no breaks — and traces it in technical pen on archival paper with an AxiDraw plotter. Nothing is printed. Every impression is *drawn*, so each carries the minor variation of the medium; editions are limited, made to order, signed, and numbered.
+
+This repository is the PlotFlow homepage — a no-build static site (plain HTML/CSS/JS, no framework, no bundler) hosted on GitHub Pages. Its centerpiece is an interactive **Live Plot** that animates a suit being drawn line-by-line by a virtual plotter, alongside the shop of current editions.
+
+## The work
+
+- **Drawn, not printed** — technical pen on 300gsm archival stock, never a print
+- **One continuous line** — each suit is a single unbroken path
+- **Limited editions** — made to order, signed and numbered
+- Variation in line and ink is a feature of the medium, not a flaw
+
+## Process
+
+1. **Vectorize** (ベクター化) — the suit is rebuilt as one continuous vector path
+2. **Plot** (作画) — an AxiDraw traces it in ink; a single A1 can run for hours
+3. **Finish** (仕上げ) — inspected, signed, and numbered
+
+---
 
 ## Run locally
 
+No build step or dependencies — the edition data is inlined as a script.
+
 ```bash
 python3 -m http.server 8000
 # visit http://localhost:8000
 ```
 
 ## Deploy
 
-Push to `main`. GitHub Pages serves from the repo root automatically.
+Hosted on GitHub Pages ("deploy from a branch", root). Pushing to `main` deploys automatically.
 
 ```bash
 git add -A && git commit -m "update site" && git push
@@ -20,12 +49,18 @@ git add -A && git commit -m "update site" && git push
 ## Structure
 
 ```
-├─ index.html           # homepage
+├─ index.html           # homepage + Live Plot hero
 ├─ styles/              # tokens.css (design tokens) + styles.css
-├─ scripts/             # plotter.js (live plot) + shop.js (edition grid)
-├─ data/editions.js     # SVG path data for all editions (auto-generated)
-├─ assets/plots/        # source SVG files
-├─ tools/               # Python scripts to regenerate data from SVGs
-├─ CNAME                # custom domain config (plotflow.io)
+├─ scripts/             # plotter.js (Live Plot) + shop.js (edition grid)
+├─ data/editions.js     # SVG path data for every edition (auto-generated)
+├─ assets/plots/        # source SVG art
+├─ tools/               # Python scripts to regenerate data from the SVGs
+├─ CNAME                # custom domain (plotflow.io)
 └─ .nojekyll            # disables Jekyll processing
 ```
+
+**To add or change an edition:** drop a clean SVG into `assets/plots/`, register it in `tools/build_data.py`, then run that script to regenerate `data/editions.js`. The shop grid and Live Plot pick it up automatically.
+
+---
+
+<sub>© 2026 PLOTFLOW ART HOUSE* — plotted in the U.S.A. · 一筆書き · one continuous line</sub>