v0.2.2: Cloudflare AI Gateway Unified Billing

Changes

• Unified Billing: Migrate from direct OpenAI API key to Cloudflare AI Gateway Unified Billing
  • Replace OPENAI_API_KEY secret with CF_AIG_TOKEN
  • Use cf-aig-authorization header instead of Authorization
  • Single billing through Cloudflare credits

Configuration

Required Worker secret:

pnpm wrangler secret put CF_AIG_TOKEN

Prerequisites:

1. Load credits in Cloudflare Dashboard → AI → AI Gateway → Credits
2. Create Cloudflare API token with AI Gateway permissions
3. Ensure AI Gateway append-gateway exists

Files Changed

• packages/api/src/lib/suggestions.ts - Auth header and config interface
• packages/api/src/routes/batch.ts - Bindings and validation
• docs/adr/0006-openai-gpt-5-mini-via-ai-gateway.md - Updated to Unified Billing
• docs/vertical-slice.md - Updated Step 3 config