- _quantize_to_tick_conservative: BUY→ROUND_FLOOR (never up into ask), SELL→ROUND_CEILING (never down into bid)
- Removed unused _quantize_to_step (size/step quantization at venue-dialect submit, not placer)
- Fixed cross-quantize tests: with conservative rounding, BUY floors down, SELL ceilings up → never crosses
- Added TestQuantizeToTickConservative with 8 tests for side-aware rounding
- Mutation-litmus: spread gate, TAKER gate, quantize-cross all RED on inversion
- 33 placer tests + 30 router + 18 drive_loop = 81 total green
- Drive_loop.py (commit 670b739a) now consumes pre_submit via wants_placement
First code of the Unified Execution Layer (SPEC_UNIFIED_EXEC_LAYER_20260714.md). Pure
policy, stdlib+Decimal only, zero I/O, zero venue knowledge, zero importers elsewhere —
adopting it breaks nothing (freeze-safe; operator unparked the build 2026-07-14).
- contract.py: ExecutionRequest input surface (§2.1) + V-TYPES (Side, UrgencyClass,
ProtectiveSpec, ExecutionAdvice), frozen, validated-at-construction, illegal states
unrepresentable. 'an asset, a size, and a prayer'.
- router.py: decide(request) -> RoutingDecision — total pure map of the §6 urgency
ladder. Encodes A1 adjudication verdict in the architecture: Router=whether-maker,
SmartPlacer=where-in-book via the wants_placement/pre_submit seam. Complementary.
- _constants.py: policy magnitudes with provenance; PROVISIONAL ones flagged for
L8/L10 calibration (never vibes, never a hardcoded cadence).
- test_exec_unified.py: 26 behaviour + mutation-litmus tests. Verified RED under
CATASTROPHIC->MAKER and ACQUIRE cross_on_expiry->True mutations.
Not yet wired: PINK drive-loop port (§7), venue dialect (§11), telemetry (§12).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
