Establish Soul Frame research repository and workplans

Scaffold the research layout from the research program, add INTENT/SCOPE,
research instruments, concept stubs, and SOUL-WP-0001–0008 phase workplans.
Register the repo with State Hub under domain agents for hub-synced execution.

concepts/persona.md

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+# Persona
+
+**Status:** provisional  
+**See also:** H8, TE-06
+
+## Working definition
+
+A **Persona** is the situated presentation of a Being within a particular context,
+purpose, role, and relationship.
+
+Historical root: *persona* as mask.
+
+**Persona = projection of a Being into context**
+
+A single Being can manifest many Personae while retaining identity continuity.
+
+## Stack reminder
+
+Being ≠ Persona ≠ Character ≠ Actor