Add file-based cache for API calls with configurable TTL#6
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Adds a lightweight cache to metals.dev API calls so you hit the API at most once per day (or configurable interval), drastically reducing usage against the free tier's 100-request/month limit.
Changes
src/cache.ts— file-based cache manager (~/.cache/goldcli/)src/metals-api.ts— cache integration with TTL checks and incremental timeseries fetchingsrc/prices.ts— threadsrefreshparam throughsrc/index.ts— new--refresh/-fCLI flagCONTEXT.md— project glossary with cache terms.env.example— documentedCACHE_MAX_AGE_HOURS