updating documentation for the project

CLAUDE.md

@@ -4,6 +4,48 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 
 ## Project
 
-**morningedition** — a morning edition printable newspaper generator.
+**morningedition** — prints a daily morning "newspaper" receipt on an Epson TM-T88V thermal printer
+at 6:30am via cron. One Python script, no dependencies beyond stdlib.
 
-This repository is in early/empty state. No build system, dependencies, or code structure has been established yet.
+## Printer
+
+- **Model:** Epson TM-T88V (M244A), USB, 80mm paper rolls
+- **CUPS name:** `receipt`
+- **Print command:** `lpr -P receipt -o raw` — raw ESC/POS, do not use CUPS rendering mode
+- **Paper cut:** `GS V 0x00` ESC/POS byte in the output stream
+- **ASCII only** — no emoji, no unicode; use `.encode("ascii", errors="replace")`
+- **Current WIDTH = 30** — printer NV is locked to 58mm mode; fix via Epson TM Utility
+  (Windows) then set WIDTH = 42. Do not change WIDTH without fixing the printer first.
+
+## Architecture
+
+`morningedition.py` is a single self-contained script:
+
+1. Fetches weather from `wttr.in/{zipcode}?format=j1` (JSON)
+2. Fetches RSS headlines from ABC13 and BBC
+3. Builds a receipt as a list of ASCII text lines
+4. Wraps lines in ESC/POS framing bytes (`INIT + FONT_A + body + CUT`)
+5. Pipes raw bytes to `lpr -P receipt -o raw`
+
+The `--preview` flag dumps the text portion to stdout instead of printing.
+
+## Key constants (morningedition.py)
+
+| Constant | Value | Notes |
+|---|---|---|
+| `WIDTH` | 30 | chars per line; change to 42 after fixing printer NV |
+| `PRINTER` | `"receipt"` | CUPS printer name |
+| `ZIPCODE` | `"77433"` | Bridgeland, Cypress TX |
+| `NAME` | `"Rich"` | used in greeting |
+
+## Content rotation
+
+Quotes, jokes, facts, and local tips rotate by `day_of_year % len(list)` — no state file needed.
+
+## What to avoid
+
+- Do not use `lpr -o TmxPaperCut=CutPerJob` — CUPS mode renders at huge font size
+- Do not use emoji or unicode characters anywhere in output
+- Do not add external dependencies; stdlib only
+- NHL API (`api-web.nhle.com`) returns 403 — do not use
+- `investing.com` scraping is unreliable — do not use