[mspinola]

Summary

• ES, NQ, YM and RTY add their micro contracts to sum_codes at scale 0.1: 13874U (from 2020-07), 209747 (2020-08), 124608 (2022-07), 239747 (2021-11). RTY is the first symbol carrying both hist_codes and sum_codes.
• Unconditional, not gated on a share or a date. Measured on the mini-vs-micro weeks: micros are 1% of notional open interest for ES and RTY and 6% for NQ in 2026; retail-heavy (non-reportable 40 to 44% of gross against 6 to 15% in the minis); they move the commercial net by 0.1 to 0.6 points of OI on average, at most 3 (NQ). The ES and RTY micros sit at about 32 reportable traders, just above the CFTC's 20-trader publication floor, so a gate would add a second on/off on top of the weeks the CFTC already drops.
• Registry-only change plus the comment and CHANGELOG; no code change. Fractional contract counts appear on micro weeks (one micro = 0.1 mini), as the grain 0.2 scale already produces.

Verification

The CFTC Consolidated row (13874+, 20974+, 12460+) is mini + micro/10 since the big contracts delisted, but it stayed in big-contract units until 2023-04-25 and switched to mini units on 2023-05-02 (a unit break in the CFTC's own series; the registry comment now says so). Against the mini-unit stretch, after a real producer run into a scratch store:

	weeks since 2023-05-02	OI within 5 contracts	within 1%
ES	180	100%	100%
NQ	180	100%	100%
YM	180	99.4%	99.4%

RTY (no Consolidated row): 2002-08-13 to 2026-10-06, 1,254 weeks, no duplicate dates, the 2017 ICE-to-CME switch still on 2017-09-12, micro adds from 2021-11-30 (OI 469,382.8 that week).

Test plan

• tests/test_registry.py::test_equity_sum_codes: the full sum_codes for ES, NQ, YM, RTY, EMD and codes_for (deduped; hist + sum for RTY)
• Full suite passes; ruff check src tests scripts clean
• End-to-end producer run for the four micro codes plus both RTY codes into a scratch store; checks above

Deployment

Same as #124: the producers fetch the four new per-code files on their next run after the Windows box pulls. Until then the four symbols read as #124 left them.

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