Add run-scoped skill and prompt asset management

backend/skills/builtin/fundamental_review/SKILL.md

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+---
+name: fundamental_review
+description: Review a company from a fundamentals-first perspective before issuing a trading signal.
+---
+
+# Fundamental Review
+
+Use this skill when the task requires judging business quality, balance-sheet strength, profitability, or long-term earnings durability.
+
+## Workflow
+
+1. Check profitability, growth, financial health, and efficiency before forming a conclusion.
+2. Separate durable business quality from short-term noise.
+3. State what would invalidate the thesis.
+4. End with a clear signal, confidence, and the main drivers behind that signal.
+
+## Guardrails
+
+- Do not rely on one metric in isolation.
+- Call out missing data explicitly.
+- Prefer conservative conclusions when financial quality is mixed.