- Add OAuth client-credentials token exchange to both Lambda handlers
- Fix sandbox/prod base URL (api-sb.bofa.com / api.bofa.com)
- Fix issueAction casing to add_Issue / cancel_Issue per API docs
- Fix transaction inquiry response parsing (accountTransactions array)
- Move all BoA config (app IDs, bank ID) from env vars to SSM params
- Update template.yaml with correct SSM param names and policies
- Add project README with architecture, API details, and SSM param reference