ci: add build & release workflow

.github/workflows/release.yml

@@ -0,0 +1,92 @@
+name: Build & Release
+
+on:
+  push:
+    tags:
+      - 'v*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    container:
+      image: espressif/idf:v5.5.2
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Build firmware
+        shell: bash
+        run: |
+          . $IDF_PATH/export.sh
+          idf.py set-target esp32s3
+          idf.py build
+
+      - name: Prepare release artifacts
+        shell: bash
+        run: |
+          . $IDF_PATH/export.sh
+          VERSION="${GITHUB_REF_NAME}"
+
+          # Generate merged firmware for single-command flashing
+          esptool.py --chip esp32s3 merge_bin \
+            --flash_mode qio \
+            --flash_size 16MB \
+            --flash_freq 80m \
+            -o "mimiclaw-full-${VERSION}.bin" \
+            0x0     build/bootloader/bootloader.bin \
+            0x8000  build/partition_table/partition-table.bin \
+            0xf000  build/ota_data_initial.bin \
+            0x20000 build/mimiclaw.bin
+
+          # Copy individual binaries with version suffix
+          cp build/mimiclaw.bin              "mimiclaw-${VERSION}.bin"
+          cp build/bootloader/bootloader.bin "bootloader-${VERSION}.bin"
+          cp build/partition_table/partition-table.bin "partition-table-${VERSION}.bin"
+          cp build/ota_data_initial.bin      "ota_data_initial-${VERSION}.bin"
+
+      - name: Create Release
+        uses: softprops/action-gh-release@v2
+        with:
+          generate_release_notes: true
+          body: |
+            ## Flashing Guide
+
+            ### 1. Merged firmware (easiest)
+
+            Download `mimiclaw-full-${{ github.ref_name }}.bin` and flash with a single command:
+
+            ```bash
+            esptool.py --chip esp32s3 -b 460800 write_flash 0x0 mimiclaw-full-${{ github.ref_name }}.bin
+            ```
+
+            ### 2. Individual binaries (advanced)
+
+            ```bash
+            esptool.py --chip esp32s3 -b 460800 write_flash \
+              0x0     bootloader-${{ github.ref_name }}.bin \
+              0x8000  partition-table-${{ github.ref_name }}.bin \
+              0xf000  ota_data_initial-${{ github.ref_name }}.bin \
+              0x20000 mimiclaw-${{ github.ref_name }}.bin
+            ```
+
+            ### 3. OTA update (for devices already running MimiClaw)
+
+            Upload `mimiclaw-${{ github.ref_name }}.bin` via the OTA endpoint.
+
+            ### 4. First-time setup
+
+            After flashing, connect via serial (115200 baud) and configure:
+
+            ```
+            wifi <ssid> <password>
+            tg_token <your-telegram-bot-token>
+            api_key <your-anthropic-api-key>
+            reboot
+            ```
+          files: |
+            mimiclaw-full-${{ github.ref_name }}.bin
+            mimiclaw-${{ github.ref_name }}.bin
+            bootloader-${{ github.ref_name }}.bin
+            partition-table-${{ github.ref_name }}.bin
+            ota_data_initial-${{ github.ref_name }}.bin