0.1.0-m1 - Financial correctness and auditability

[stefan-jansen]

Milestone 1

• Reject invalid configuration and execution costs atomically #41 Reject invalid configuration and execution costs atomically
• Reconcile partial-close costs exactly #42 Reconcile partial-close costs exactly
• Preserve rejected orders in results and exports #43 Preserve rejected orders in results and exports
• Preserve forced-liquidation causes through immediate fills #44 Preserve forced-liquidation causes through immediate fills
• Make result artifacts validated and failure-explicit #45 Make result artifacts validated and failure-explicit
• Define deterministic pre-risk callback state #46 Define deterministic pre-risk callback state

Verification

• uv run pytest tests/ -q
• uv run ruff check --no-fix src/ tests/
• uv run ruff format --check src/ tests/
• uv run ty check
• pre-commit run --all-files