The default SOUL.md seeded for new users should match
DEFAULT_AGENT_IDENTITY — a short, neutral identity paragraph.
The elaborate voice spec (avoid lists, dialogue examples, symbol
conventions) was never intended as the default for all users.
Users who want a custom persona write their own SOUL.md.
Seed ~/.hermes/SOUL.md when missing, load SOUL only from HERMES_HOME, and inject raw SOUL content without wrapper text. If the file exists but is empty, nothing is added to the system prompt.
