perf: serve mapping lookups from the in-memory cache - #47
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Every resolve went through load_mappings, which stats the mapping file and reads the etag file before consulting the cache -- two disk reads per search request. The refresh task is the sole writer and updates the cache itself, so lookups now clone the cached index directly and only fall back to disk when the cache was never hydrated. External edits to data/mappings.json are now picked up on refresh/restart rather than immediately.
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Every resolve went through load_mappings, which stats the mapping file and reads the etag file so two disk reads per search request.
The refresh task is the sole writer and updates the cache itself, so lookups now clone the cached index directly.