build: Add release build script and GitHub release guide

- build-release.sh: Cross-platform binary builder (5 platforms)
- GITHUB_RELEASE_GUIDE.md: Step-by-step release instructions
- Built binaries: release/v0.3.0/ (not committed)

All binaries tested and ready for GitHub release.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: erudenko

GITHUB_RELEASE_GUIDE.md

@@ -0,0 +1,102 @@
+# GitHub Release Guide for v0.3.0
+
+## Step 1: Push Commits and Create Tag
+
+```bash
+# Push all commits
+git push origin main
+
+# Create and push tag
+git tag -a v0.3.0 -m "Phase 3: Fix A4/A5 + Complete Result/Option Implementation"
+git push origin v0.3.0
+```
+
+## Step 2: Create GitHub Release
+
+### Using GitHub CLI (gh)
+
+```bash
+gh release create v0.3.0 \
+  --title "Dingo v0.3.0 - Phase 3 Release" \
+  --notes-file RELEASE_NOTES_v0.3.0.md \
+  release/v0.3.0/*
+```
+
+### Using GitHub Web UI
+
+1. Go to https://github.com/MadAppGang/dingo/releases/new
+
+2. **Tag**: `v0.3.0`
+
+3. **Title**: `Dingo v0.3.0 - Phase 3 Release`
+
+4. **Description**: Copy content from `RELEASE_NOTES_v0.3.0.md`
+
+5. **Attach Binaries**:
+   - Upload files from `release/v0.3.0/`:
+     - `dingo-v0.3.0-darwin-amd64`
+     - `dingo-v0.3.0-darwin-arm64`
+     - `dingo-v0.3.0-linux-amd64`
+     - `dingo-v0.3.0-linux-arm64`
+     - `dingo-v0.3.0-windows-amd64.exe`
+
+6. **Release Type**:
+   - ☑️ Set as the latest release
+   - ☐ Set as a pre-release (uncheck - this is a stable release)
+
+7. Click **"Publish release"**
+
+## Step 3: Verify Release
+
+After publishing:
+
+1. Check release page: https://github.com/MadAppGang/dingo/releases/tag/v0.3.0
+2. Test download links for each platform
+3. Verify release notes display correctly
+
+## Binary Installation Instructions (for users)
+
+### macOS (ARM - M1/M2/M3)
+```bash
+curl -L https://github.com/MadAppGang/dingo/releases/download/v0.3.0/dingo-v0.3.0-darwin-arm64 -o dingo
+chmod +x dingo
+sudo mv dingo /usr/local/bin/
+```
+
+### macOS (Intel)
+```bash
+curl -L https://github.com/MadAppGang/dingo/releases/download/v0.3.0/dingo-v0.3.0-darwin-amd64 -o dingo
+chmod +x dingo
+sudo mv dingo /usr/local/bin/
+```
+
+### Linux (AMD64)
+```bash
+curl -L https://github.com/MadAppGang/dingo/releases/download/v0.3.0/dingo-v0.3.0-linux-amd64 -o dingo
+chmod +x dingo
+sudo mv dingo /usr/local/bin/
+```
+
+### Linux (ARM64)
+```bash
+curl -L https://github.com/MadAppGang/dingo/releases/download/v0.3.0/dingo-v0.3.0-linux-arm64 -o dingo
+chmod +x dingo
+sudo mv dingo /usr/local/bin/
+```
+
+### Windows
+Download `dingo-v0.3.0-windows-amd64.exe` and add to PATH.
+
+## Post-Release Checklist
+
+- [ ] Push commits and tag
+- [ ] Create GitHub release
+- [ ] Upload all binaries
+- [ ] Test download links
+- [ ] Update landing page (optional)
+- [ ] Announce on social media (optional)
+- [ ] Update README with v0.3.0 features (optional)
+
+---
+
+**Ready to ship!** 🚀

build-release.sh

@@ -0,0 +1,44 @@
+#!/bin/bash
+# Build Dingo binaries for multiple platforms
+
+set -e
+
+VERSION="v0.3.0"
+BUILD_DIR="release/${VERSION}"
+
+echo "🐕 Building Dingo ${VERSION} for multiple platforms..."
+
+# Create release directory
+mkdir -p "${BUILD_DIR}"
+
+# Build for different platforms
+platforms=(
+    "linux/amd64"
+    "linux/arm64"
+    "darwin/amd64"
+    "darwin/arm64"
+    "windows/amd64"
+)
+
+for platform in "${platforms[@]}"; do
+    IFS='/' read -r GOOS GOARCH <<< "$platform"
+
+    output_name="dingo-${VERSION}-${GOOS}-${GOARCH}"
+    if [ "$GOOS" = "windows" ]; then
+        output_name="${output_name}.exe"
+    fi
+
+    echo "  Building ${GOOS}/${GOARCH}..."
+
+    GOOS=$GOOS GOARCH=$GOARCH go build \
+        -ldflags="-X 'main.Version=${VERSION}' -X 'main.BuildTime=$(date -u +%Y-%m-%dT%H:%M:%SZ)'" \
+        -o "${BUILD_DIR}/${output_name}" \
+        ./cmd/dingo
+
+    echo "  ✓ ${output_name}"
+done
+
+echo ""
+echo "✅ Build complete! Binaries in: ${BUILD_DIR}/"
+echo ""
+ls -lh "${BUILD_DIR}/"