fix(builder): stop offering boards without PSRAM

The Config Builder listed the AtomS3/AtomS3 Lite and a generic ESP32
DevKit, neither of which has PSRAM — so it could hand out a
ready-to-flash YAML for a board the project no longer supports.

Removes both from site/boards.js and deletes their boards/*.yaml
reference configs. A new boards.shape test asserts every board defines
PSRAM, so a psram-less entry can't come back unnoticed.

Claude-Session: https://claude.ai/code/session_01RgSnMCa3JQigphGnPbazdw

Author: RAR

CHANGELOG.md

@@ -15,6 +15,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **Docs site recoloured to the brand mark.** Link and accent colours moved from green to the mark's silicon indigo and busbar silver; amber keeps its one meaning — this part is live. The blueprint grid behind the headline is now a PV array receding toward the horizon — cells, busbars and module frames, drawn in CSS gradients so it stays sharp at any size and re-tints with the theme.
 - **New brand mark.** The green-to-blue tile is replaced by an optimizer emitting a telemetry frame, in silicon indigo and amber. It's drawn at three sizes rather than scaled — the device favicon, the device UI sidebar, and the docs — so it stays legible in a browser tab. The docs site had no logo or favicon configured before and now carries the same mark the device serves.
 
+### Removed
+- **Boards without PSRAM are no longer offered.** The Config Builder listed the M5Stack AtomS3/AtomS3 Lite and a generic ESP32 DevKit, both of which lack PSRAM — so it could hand you a ready-to-flash YAML for a board the project doesn't support. Both are gone from the builder, along with their `boards/*.yaml` reference configs, and a test now blocks a PSRAM-less board from being added back.
+
 ### Fixed
 - **Opening the web UI could reboot the device.** History pages read the TSDB from the web server's task while the 30-minute snapshot writes it from another — and on the ESP32-S3 every flash access, read included, cuts the instruction cache on both cores, so the two collide and fault (`Fault - Unknown`). All LittleFS access now goes through one lock. History requests can queue briefly (a month-range query holds the flash ~2.3 s) and return an error rather than hang if they wait more than 15 s.
 

boards/README.md

@@ -2,17 +2,12 @@
 
 This directory contains optimized ESPHome configurations for different ESP32 boards used with the Tigo Monitor system.
 
+**PSRAM is required.** Only boards that have it are configured here.
+
 ## Available Configurations
 
 ### ESP32-S3 Boards
 
-#### `esp32s3-atoms3.yaml` - M5Stack AtomS3 (No PSRAM)
-- **Board**: M5Stack AtomS3
-- **PSRAM**: None
-- **CPU**: 240MHz
-- **Recommended for**: Standard installations (up to ~30 devices)
-- **UART Buffers**: 2048 RX / 512 TX
-
 #### `esp32s3-atoms3r.yaml` - M5Stack AtomS3R (8MB PSRAM)
 - **Board**: M5Stack AtomS3R (same as AtomS3 with different model)
 - **PSRAM**: 8MB (Octal)
@@ -31,16 +26,6 @@ This directory contains optimized ESPHome configurations for different ESP32 boa
 - **UART Buffers**: 16384 RX / 1024 TX (listen-only, no transmission)
 - **Special optimizations**: High-frequency FreeRTOS tick, tickless idle disabled
 
-### Standard ESP32 Boards
-
-#### `esp32-dev.yaml` - Generic ESP32 DevKit (No PSRAM)
-- **Board**: Generic ESP32 DevKit
-- **PSRAM**: None
-- **CPU**: 240MHz
-- **Recommended for**: Small installations (up to ~12 devices)
-- **UART Buffers**: 1024 RX / 256 TX
-- **Note**: Limited by available heap memory
-
 ## Usage
 
 To use a board configuration, include it in your main YAML file:
@@ -72,8 +57,8 @@ Adjust these in your main configuration if your hardware differs.
 ## Performance Notes
 
 - **ESP32-P4** offers the best performance with massive PSRAM and higher CPU frequency
-- **ESP32-S3** variants are the sweet spot for most installations
-- **Standard ESP32** is adequate for small systems but may struggle with web server + many devices
+- **ESP32-S3 with PSRAM** is the sweet spot for most installations
+- Boards without PSRAM are not supported — the web server and device tables have nowhere to live and the firmware goes unstable
 
 ## Customization
 

boards/esp32-dev.yaml

@@ -212,29 +212,6 @@ font:
     size: 9`,
     notes: ['Built-in tail485 RS485 transceiver on GPIO1/GPIO2.'],
   },
-  {
-    id: 'esp32s3-atoms3',
-    label: 'M5Stack AtomS3 / AtomS3 Lite (ESP32-S3, no PSRAM)',
-    chip: 'esp32s3', board: 'm5stack-atoms3', variant: 'esp32s3',
-    psram: null,
-    partitions: null,
-    frameworkAdvanced: { enable_idf_experimental_features: false },
-    frameworkComponents: [],
-    hostedComponent: null,
-    sdkconfig: {
-      CONFIG_ESP32S3_DEFAULT_CPU_FREQ_240: 'y',
-      CONFIG_UART_ISR_IN_IRAM: 'y',
-      CONFIG_UART_RX_BUFFER_SIZE: '1024',
-      CONFIG_UART_TX_BUFFER_SIZE: '512',
-      CONFIG_FREERTOS_QUEUE_REGISTRY_SIZE: '16',
-    },
-    hosted: null,
-    uartDefault: { tx_pin: 'GPIO6', rx_pin: 'GPIO5', rx_buffer_size: 1024 },
-    numberOfDevices: 15,
-    supports: { ble: false, display: false },
-    displayOverlay: null,
-    notes: ['No PSRAM: History/tsdb persistence is not configured on this board.'],
-  },
   {
     id: 'esp32p4-evboard',
     label: 'ESP32-P4 Function EV Board (32MB PSRAM, C6 Wi-Fi)',
@@ -297,29 +274,6 @@ font:
       'PSRAM is hex mode only; valid speeds are 20/100/200 MHz (200 default). If a specific board crash-loops at boot, drop to 100 or 20 MHz — a per-board PSRAM quirk, not a universal limit.',
     ],
   },
-  {
-    id: 'esp32-dev',
-    label: 'Generic ESP32 DevKit (classic ESP32)',
-    chip: 'esp32', board: 'esp32dev',
-    psram: null,
-    partitions: null,
-    frameworkAdvanced: { enable_idf_experimental_features: false },
-    frameworkComponents: [],
-    hostedComponent: null,
-    sdkconfig: {
-      CONFIG_ESP32_DEFAULT_CPU_FREQ_240: 'y',
-      CONFIG_UART_ISR_IN_IRAM: 'y',
-      CONFIG_UART_RX_BUFFER_SIZE: '1024',
-      CONFIG_UART_TX_BUFFER_SIZE: '256',
-      CONFIG_FREERTOS_QUEUE_REGISTRY_SIZE: '16',
-    },
-    hosted: null,
-    uartDefault: { tx_pin: 'GPIO1', rx_pin: 'GPIO3', rx_buffer_size: 1024 },
-    numberOfDevices: 12,
-    supports: { ble: false, display: false },
-    displayOverlay: null,
-    notes: ['Limited RAM: keep number_of_devices low; History/tsdb not configured.'],
-  },
 ];
 
 export function getBoard(id) {