feat: update ESP32 board version and add LSP configs

.crushmemory

@@ -33,3 +33,38 @@ BOARD=esp32-32e-4 mise run install   # Install libs (shared + board)
 
 ## Known Fixes
 - dashboard/off admin commands now reset inactivity timer (DoorbellLogic.cpp:234,240)
+
+## Reverted Changes Log
+Track changes that were reverted to avoid flapping:
+- 2025-02-18: Initially configured LSP via neovim/mason (`.config/nvim/lua/plugins/arduino.lua`) — user clarified they wanted Crush-native LSP config instead
+
+## Documentation Lookup Rule
+When uncertain about CLI tool flags or argument syntax:
+1. Run the tool with `-h` or `--help` first
+2. If unclear, search for official documentation matching the tool version
+3. Prefer checking the tool's own help/docs over guessing
+4. For Arduino CLI, check `arduino-cli <command> --help` or official Arduino CLI docs
+
+## Neovim LSP Configuration
+For Neovim projects:
+- Use Mason + mason-lspconfig to manage LSP installations
+- Add LSP configs to `~/.config/nvim/lua/plugins/` as separate plugin files
+- Use `on_new_config` for dynamic settings (e.g., BOARD env var → FQBN mapping)
+- Example: `~/.config/nvim/lua/plugins/arduino.lua` (arduino-language-server)
+
+## Crush LSP Configuration
+- Configure via `.crush.json` in project root (or `$HOME/.config/crush/crush.json` globally)
+- Supports env var interpolation: `$BOARD` or `${BOARD}`
+- Supports command substitution: `$(cat boards/$BOARD/board-config.sh | grep '^FQBN=' | cut -d'"' -f2)`
+- Example for Arduino (auto-detects FQBN from BOARD):
+```json
+{
+  "lsp": {
+    "arduino": {
+      "command": "arduino-language-server",
+      "args": ["-fqbn", "$(cat boards/${BOARD:-esp32-32e-4}/board-config.sh | grep '^FQBN=' | cut -d'\"' -f2)"]
+    }
+  }
+}
+```
+- Run `mise run gen-crush-config` to regenerate static config