Dev howiemen - #4
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- Clarify that `transition`/`record_fill` use `object.__setattr__` to write frozen fields rather than to "bypass" freezing, emphasizing engine/broker exclusivity. - Reword `DataView.portal` privacy rationale to state strategies cannot read data beyond `visible_through`, rather than only "bypass" it. - Strengthen Section 6 framing from "不允许绕过" to "必须严格生效，不可通过代码路径绕开". - Tighten Rule 11 to forbid modifications not routed through `broker` and Rule 12 to forbid leaving a half-day ledger after any exception.
- Add v0.1.3 entry: fix volatility/Sharpe dropping day-0 return due to zero-seed re-derivation in `metrics.compute_metrics`; remove dead `_drawdown_series` helper; replace regression test with hand-calculated one. - Add v0.1.2 entry: fix `resolve_source_location` to accept absolute paths; redact absolute paths from `run_metadata.json` via `os.path.relpath`; reject impossible calendar dates in `validate_yyyymmdd`; fix pyproject.toml / CLI test / README documentation drift.
- Add 6 get_factor parity tests to test_portal_parity.py (task 24.1) - Remove non-existent get_bar(symbol, date) reference in mvp-contract.md §3.3 (task 24.2) - Fix DataView._portal privacy wording to reflect Python semantics (task 24.3) - Collapse duplicate "00000000" sentinel to single SENTINEL_NO_HISTORY in data.validators - Harden test_version_matches_pyproject with whitespace and semver shape checks - Update README badge and status to v0.1.4
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