Create Draft

Create a server-side draft.

Body: { "from_handle": "brian@tandem-cc.com", # required "to": ["joe@tandem-cc.com"], # required, >=1 recipient "body": "...", # required (may be empty string) "subject": "...", # optional "cc": ["..."], # optional "in_reply_to": "m_...", # optional; resolves thread_id "drafted_by": "claude" | "human" # optional; default "claude" }

Returns the created draft including its draft_id.