Add: SOUL.md intro & 3 approaches — sources ingested (official/community/persona)

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+# Raw Source: SOUL.md — Approach C (Persona / Personality-Driven)
+
+Source: https://hermes-agent.nousresearch.com/docs/user-guide/features/personality (built-in personalities / /personality overlay section)
+Source: https://hermes-agent.nousresearch.com/docs/guides/use-soul-with-hermes (SOUL.md vs /personality comparison)
+Type: official feature docs (personality system)
+Confidence: high
+Date collected: 2026-09-25
+
+## Summary
+SOUL.md defines the durable baseline identity. `/personality` provides session-level overlays. The framework supports custom personality presets defined in `config.yaml` (`agent.personalities`). Each profile can have its own `SOUL.md` (via profile directory under `profiles/<name>/`).
+
+## Key differences
+- SOUL.md = durable identity; /personality = temporary mode switch.
+- Profile-level SOUL.md isolation: `hermes profile create --clone` creates independent persona files.
+- Personality presets defined in YAML (`agent.personalities:`) apply to the whole session without touching SOUL.md file.
+- Personality names are stored in display metadata; personal files stay in SOUL.md.