4bda01e627
Settled prose design from #3: a reader returning neutral InstrumentGeometry (digits, pip_size, tick_size, lot_size, base, quote) from <SYMBOL>.meta.json. Signed autonomously under /boss on the grounding-check PASS; fork decisions (base/quote pass-through, unknown-version -> None, serde_json, no caching) are logged on the reference issue. refs #3