Summary

• Adds mog mail draft subcommand to create draft messages via Graph API (POST /me/messages)
• Recipients are optional — drafts can be created without --to and completed later in Outlook
• Includes --dry-run support following the existing pattern
• Uses Mail.ReadWrite scope (required for creating messages)
• Supports both delegated and app-only auth modes

Usage

# With recipients
mog mail draft --subject "Subject" --to recipient@example.com --body "Body text"

# Without recipients (complete later in Outlook)
mog mail draft --subject "Subject" --body "Body text"

# Preview
mog mail draft --subject "Subject" --to recipient@example.com --dry-run

Changes

• internal/services/mail/service.go: Add Draft() method and draftMailScopes
• internal/cmd/mail.go: Add MailDraftCmd struct and Run() method
• internal/cmd/runtime.go: Add capMailDraft capability constant and rule
• internal/cmd/mail_test.go: Add flag parsing tests (with and without recipients)

Test plan

• All existing tests pass (go test ./...)
• New tests: TestMailDraftFlagParsesWithoutTo, TestMailDraftFlagParsesWithTo
• --dry-run verified manually
• --help output verified

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