Add CLAUDE.md documenting architecture and deploy pipeline

CLAUDE.md

@@ -0,0 +1,64 @@
+# Lunch Notifier
+
+Single-file Flask app that scrapes the daily Mariposa (Kyrene school
+district) lunch menu and texts it to a list of phone numbers via
+email-to-SMS carrier gateways (e.g. `4805551234@vtext.com` for Verizon).
+Runs as one Docker container on the user's Unraid home server.
+
+## Architecture
+
+- **`app.py`** — everything: Flask web UI/API, APScheduler-style job
+  scheduling (`schedule` library), and the email-to-SMS send logic
+  (`smtplib` via Gmail, app password auth). The HTML/CSS/JS frontend is
+  embedded as a Python string constant (`HTML`) rather than a separate
+  template file — no build step, no template engine.
+- **`scraper.py`** — fetches and parses the school's published lunch menu.
+- **`scheduler.py`** — day-of-week/time scheduling helpers used by `app.py`.
+- Settings (phone numbers, send time, days, vacation date ranges) persist
+  to `/data/settings.json`, not environment variables — env vars
+  (`PHONE_NUMBER`, `RUN_TIME`, `RUN_DAYS`) are defaults used only the very
+  first time, before a settings file exists.
+- Vacation ranges suppress sends without disabling the schedule — checked
+  fresh on every run via `is_on_vacation()`.
+
+## Local development
+
+```bash
+pip install -r requirements.txt
+python3 app.py
+```
+
+Needs `GMAIL_USER` and `GMAIL_APP_PASSWORD` env vars to actually send
+(a Gmail **app password**, not the account password — required since Gmail
+disallows plain SMTP auth with the real password). Visit
+`http://localhost:2323`.
+
+## Deployment
+
+**Target:** Unraid server, container path `/mnt/user/appdata/lunch-notifier`,
+built from `Dockerfile`/`docker-compose.yml` in this repo. Container name
+`Lunch-Notifier`, port `2323`. No reverse proxy — accessed directly via
+`http://<server-ip>:2323` on the LAN.
+
+**Deploy mechanism: Forgejo push-to-deploy**, same pattern as the other
+three projects on this box (`card-grader`, `n64-tracker`, `arr-summary`) —
+see `card-grader`'s `CLAUDE.md` for the full pipeline mechanics (runner
+config, HTTPS-not-SSH git auth, known tradeoffs). In short: push to `main`
+on the `forgejo` remote (`https://git.hippofam.com/ninja_hippo/lunch-notifier.git`)
+triggers `.forgejo/workflows/deploy.yml`, which syncs into
+`/mnt/user/appdata/lunch-notifier` (excluding `.git`, `.env`, `data/`) and
+runs `docker compose up -d --build`.
+
+**Persistent state, never touched by deploys:** `data/settings.json` (the
+volume-mounted `/data` inside the container) holds phone numbers, schedule,
+and vacation ranges — this is live user data, not deploy-managed. `.env`
+holds `GMAIL_USER`/`GMAIL_APP_PASSWORD`/`PHONE_NUMBER` etc. and is
+server-only, gitignored, never committed.
+
+**Migration note (2026-08-25):** this container originally used a Docker
+**named volume** (`lunch-notifier_lunch-settings`) instead of a bind mount.
+That meant Unraid's Appdata Backup plugin — which only knows about
+`/mnt/user/appdata` and `/mnt/cache/appdata` as backup sources — silently
+skipped it entirely; the settings data was never included in any backup.
+Migrated to a bind mount (`./data:/data`) with the existing settings copied
+over first and verified intact before the old named volume was deleted.