docs: add pre-lilygo baseline checklist

docs/pre-lilygo-baseline-checklist.md

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+# Pre-LilyGO Baseline Checklist
+
+Use this checklist before creating a release/tag for the current Cargo ESP 2-channel baseline.
+
+## Goal
+
+Capture a known-good project state before migrating Cargo ESP hardware to a LilyGO T-Relay-S3 board or other expanded-output controller.
+
+## Required Before Tagging
+
+- [ ] Tests pass with `source .venv/bin/activate && python run_tests.py`
+- [ ] Working Cargo ESP WebUI confirmed
+- [ ] Relay/output control confirmed on current 2-channel board
+- [ ] DS18B20 temperature display confirmed in WebUI
+- [ ] Cargo ESP API contract documented
+- [ ] Controller roles documented
+- [ ] Pico dashboard archived
+- [ ] Waveshare ESP32-S3 Touch LCD 5B dashboard target documented
+- [ ] Load-switching hardware boundaries documented
+- [ ] No stale active Pico/UART dashboard references remain
+- [ ] Repo is clean: `git status --short`
+
+## Suggested Tag Name
+
+    v0.1.0-cargo-esp32-2ch-baseline
+
+## Suggested Release Title
+
+    Cargo ESP32 2-Channel Relay Board Baseline
+
+## Suggested Release Notes
+
+Baseline working release before future Cargo ESP hardware migration.
+
+This release captures the current Cargo ESP32 controller architecture using the 2-channel relay board.
+
+Includes:
+
+- Cargo ESP WebUI/API architecture
+- DS18B20 temperature support
+- Relay/output control
+- HTTP API contract tests
+- Legacy Pico dashboard archived
+- ESP32-S3 Waveshare 5B dashboard direction documented
+- Controller roles clarified
+- Load-switching hardware boundaries documented
+
+Known future work:
+
+- LilyGO T-Relay-S3 hardware evaluation
+- Expanded relay/output mapping
+- OTA workflow
+- ESP32-S3 dashboard firmware
+- Dashboard screen mockups