Implement REQ-001~004 (dcy-001): scaffold the trex-core package
(pyproject, trex_core/, tests/), port the slot pure domain into
trex_core.domain.slot with import rewrites, add the EXPECTED_SLOT_FIELDS
contract guard (test_contract), and port the state/service unit tests.
Verification: 56 passed, ruff clean, import sweep shows zero external
deps, public __all__ exposes no infra symbols, contract negative case
reproduced. Align project-structure/runtime-flows baselines to the real
tree. Sync SDLC tracking: REQ-001~004 → Implemented, BAT-001 →
release-candidate.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
genichinandClaude Opus 4.8
20498aa4ce