Finance data toolkit for DeepSeek Harness agents

Key features

• A finance data toolkit for DeepSeek Harness agents: guaranteed-correct number formatting, return math, ratios, time value, and risk metrics.
• All optional, on the composition row's config
• Pure logic (lib/finance.js) has zero DSH/Cordis imports and is unit-tested in isolation
• the plugin does the arithmetic.
• lib/index.js is the thin Cordis plugin wiring the tool and the prompt section.