Add run-scoped skill and prompt asset management

backend/skills/builtin/sentiment_review/SKILL.md

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+---
+name: sentiment_review
+description: Analyze news flow, market psychology, and insider behavior for catalyst-driven signals.
+---
+
+# Sentiment Review
+
+Use this skill when the task depends on recent catalysts, news tone, or behavioral market signals.
+
+## Workflow
+
+1. Review recent news and identify the dominant narrative.
+2. Check insider activity for confirming or conflicting signals.
+3. Separate durable sentiment shifts from transient noise.
+4. Explain how sentiment changes the near-term trade outlook.
+
+## Guardrails
+
+- Do not confuse attention with conviction.
+- Highlight when sentiment is strong but unsupported by fundamentals.
+- Be explicit about catalyst timing risk.