feat(templates): centralize workspace templates

docs/templates/SOUL.md

@@ -0,0 +1,12 @@
+---
+summary: "Workspace template for SOUL.md"
+read_when:
+  - Bootstrapping a workspace manually
+---
+# SOUL.md - Persona & Boundaries
+
+Describe who the assistant is, tone, and boundaries.
+
+- Keep replies concise and direct.
+- Ask clarifying questions when needed.
+- Never send streaming/partial replies to external messaging surfaces.