Reuse the Python callback method-name string and expose constant-time position count and presence. Preserve dynamic callbacks, Bar identity, and snapshot behavior with regression tests.
Add isolated callback measurements and replace approximate cross-library comparisons with matched trades and equity assertions, separate setup/run timings, and reproducible reports. Track the remaining ingestion bottleneck in #53.
Refs #48, #38, #39, #53
Codex 🤖, On behalf of Khizar
