Phase 2A scaffolding lands FIRST per spec §4.4 ABI contract. Phase 1.2
cost kernel reads LobBar; both dev synthetic and prod fxcache produce
LobBar — dev/prod parity per Q3.
Generators: flat_market, drift_market, ou_market, regime_switch_market
(seeded RNG for reproducible tests). Regime-switch test uses sticky
0.99/0.01 transitions (true regime persistence; spec's 50/50 was a
random walk, not a regime switch — corrected with code comment).
behavioral_suite test target wired into Cargo.toml; will run all
22 Phase 2 tests once they land in Phase 2B/2C.
Audit doc: SP15 Phase 2A.1 entry appended to docs/dqn-wire-up-audit.md
per Invariant 7 (component changes require audit-doc update).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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