research: 3-year stake-sizing campaign + violent-move studies (nothing changes signals)

Walk-forward "second opinion" stake multiplier (meta-labelling on 65 decision-time
features, 3yr Oanda books @ $0.65) FAILED the pre-registered rule on M5 (clean null)
and M15 (lift inside the label-shuffle null, explained by BUY-vs-SELL). Nothing that
changes numbers ships; the 12-month M5 book re-run is byte-identical to the pinned one.

Behaviour-neutral plumbing:
- position_sizing.build_features (65 features; multiplier path returns 1.0, no artifact)
- SignalReport.penalty_tags / penalty_total / momentum_fading (record-keeping)
- TradeSetup.stake_multiplier = None (reserved)
- gpu_backtest --export-features (default export stays the pinned 63 columns; extras
  forced to the tail even when the first trade lacks an indicator)

Research tools (backtest/research): book_report, burst_map, burst_precursors,
open_trade_bursts, calendar_impact, burst_indicator_map, sizing_model, watch_rule_eval.
Findings recorded in backtest/research/sizing_campaign_2026-09.md: M5 stretch measures
are positive in both halves; every open-trade protection against violent bars loses on
both TFs; high-impact USD releases cause 20-31% of violent bars but trades held through
them do better; violent bars come when price is already at an extreme, not from calm.

Module 29 tests (13). Suite: 435 passed.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RWV2yLt3YXHHGVYHSQU2EE

CLAUDE.md

@@ -93,4 +93,5 @@ Signal currency everywhere is `SignalStrength` (−2..+2). DataFrames are UTC tz
 - Tiingo is streaming-only (`data_providers.streaming: "tiingo"`), not a designated candle fallback. Oanda-Tiingo signal parity is documented in `backtest/research/signal_parity_2026-08-14.md`; Phase 4's two-week live shadow scan remains a manual operational step.
 - Human-facing docs in `docs/` (`user_guide.html`, `beginner_guide.html` + PDF builds) must be kept in sync when signal behavior changes.
 - 2026-09-03 signal-log campaign shipped two new per-TF gates (`backtest/research/signal_log_campaign_2026-09.md`): M5 `sell_blocked_regimes=["transitioning"]` and H1 `sell_min_quality=[]` (all H1 shorts blocked). Current-HEAD M5 canonical book is now `backtest/oanda_m5_12mo_065_nopb_20260903.csv` (557 / +112.21R / PF 1.56, halves +55.9/+56.4); H1 reference `backtest/oanda_h1_12mo_065_20260903.csv` (91 / +22.2R / PF 1.79; 5yr +49.1R PF 1.46; OOS +16.7R PF 1.74).
+- 2026-09-06 stake-sizing campaign (`backtest/research/sizing_campaign_2026-09.md`): a walk-forward "second opinion" stake multiplier (meta-labelling on 65 decision-time features, 3-year Oanda books at $0.65) FAILED the pre-registered rule on M5 (clean null) and M15 (lift inside the label-shuffle null, explained by BUY-vs-SELL). Nothing that changes numbers shipped. Behaviour-neutral tooling remains: `position_sizing.build_features` + `--export-features` (default export stays 63 columns), `SignalReport.penalty_tags/penalty_total/momentum_fading`, `TradeSetup.stake_multiplier` (None; reserved), `backtest/research/{book_report,burst_map,sizing_model}.py`. Stage-B facts: M5 stretch measures are POSITIVE in both halves (do not re-propose exhaustion sizing on M5); M15 exhaustion tag is weakly negative (≈ +3R/yr, noise); bursts cluster at 12–15 UTC and 01 UTC bar-close and do NOT hurt entries.
 - Auto-execution (oanda_daemon.py / oanda_executor.py) was removed 2026-09-03 — the owner is not auto-trading; last commit containing it is 31002cb. Book-parity rules that lived in its docstring (no broker TP, 5-bar cooldown, once-per-bar trail) remain the backtester's model.