Closes the Brief 11 sequence with a decision artifact (not a roadmap)
selecting the next capability after GSM8K Phase 2 reader closure.
Four candidates compared against ADR-0166's three-question test:
- A. Continued GSM8K operator closure
- B. Cross-domain reader generalization
- C. Tool-use trace integration
- D. Workbench demo hardening
Recommendation: continued GSM8K operator closure, starting with the
`lexicon_entry` row of the Brief 11B audit. The only candidate that
passes Q1/Q2/Q3 cleanly today and has an explicit Round-3 finish line.
Docs-only. No code, no test, no eval, no pack change.
