Restore safety cutoff to 800F, faster PID loop timing, enhanced simple UI with stats/charts/flight controls, compact TTY display

wifi-onboarding-draft/README.md

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+# WiFi Onboarding Draft
+
+This folder contains a draft onboarding design for getting a piNail device onto WiFi and giving the user the correct webserver address with minimal friction.
+
+## Goals
+- Zero SSH required for end users.
+- Works on first boot with no preloaded WiFi credentials.
+- Reliable recovery if router/SSID/password changes later.
+- Stable web UI address after setup.
+
+## User Flow (Target UX)
+1. User powers on device.
+2. Device attempts connection using saved WiFi config.
+3. If connection fails (or no config), device starts setup AP: `piNail-Setup-XXXX`.
+4. User joins setup AP from phone/laptop.
+5. Captive portal opens (or user browses to `http://192.168.4.1`).
+6. User enters:
+   - WiFi SSID
+   - WiFi password
+   - Optional hostname (default `pinail`)
+   - Network mode: DHCP (recommended) or static IP
+7. Device validates, saves config, reboots.
+8. On success, user opens:
+   - `http://pinail.local:5000` (preferred)
+   - fallback LAN IP shown on success page or label.
+
+## Recommended Network Strategy
+- Default: DHCP + router DHCP reservation (best supportability).
+- Expose both mDNS and IP to users:
+  - `pinail.local`
+  - `192.168.x.y`
+
+## Files in this folder
+- `PI_IMPLEMENTATION.md`: concrete Raspberry Pi setup design.
+- `RECOVERY_AND_RUNBOOK.md`: failure handling and support steps.
+- `wifi_config.example.json`: suggested stored config schema.