New subcommand: gomailtest ews
- testconnect — HTTP/TLS probe, reports cert chain and response code
- testauth — GetFolder(Inbox) to verify credentials
- getfolder — GetFolder(Inbox) with folder stats output
- autodiscover — SOAP Autodiscover to resolve internal/external EWS URLs
Auth: NTLM (go-ntlmssp), Basic, Bearer (OAuth2), auto-detection
New dependency: github.com/Azure/go-ntlmssp
Migration plan: migration/3.2_MIGRATION_PLAN_EWS.md
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>