Add run-scoped skill and prompt asset management

backend/skills/builtin/risk_review/SKILL.md

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+---
+name: risk_review
+description: Assess portfolio and market risks before final position sizing and execution.
+---
+
+# Risk Review
+
+Use this skill when you must identify concentration, volatility, leverage, and scenario risks.
+
+## Workflow
+
+1. Review the proposed exposure by ticker and theme.
+2. Identify concentration, volatility, liquidity, and leverage concerns.
+3. Rank warnings by severity.
+4. Translate risk findings into concrete limits or cautions for the portfolio manager.
+
+## Guardrails
+
+- Focus on actionable risk controls.
+- Quantify limits when the available data supports it.
+- Distinguish fatal blockers from manageable risks.