v0.1.4

Fixes

• email_send now returns the underlying send failure detail in msg (e.g. SMTP auth/connection errors) instead of the generic "email send failed", matching the template_render diagnostics behavior. The error code stays send_failed.

Diagnosing send failures

• Sync: email_send returns {error: "send_failed", msg: "send failed: <cause>"}.
• Async campaigns: the real cause is recorded in the task last_error; inspect via task_list.

Verification

• make check
• staticcheck ./...