The double bottom joins the nightly scan (#126)

[yanivil]

Summary

The double bottom joins the nightly scan, on the evidence of #126.

Evidence (the eleven yearly point-in-time runs with all four patterns; the tuning page has the tables)

• Tuned rules: 215 signals in eleven years, 58 % reaching the target, +0.13 R per signal, month-block interval [+0.00, +0.26], positive in 7 of 11 years, max drawdown 8 R. The reward:risk floor keeps the form with a higher second low.
• Reward floor off: 752 signals at +0.10 R, interval [+0.01, +0.18], 9 of 11 years; the higher-second-low form +0.13 R [+0.04, +0.22] on 424.
• Incremental: 7 of the 215 sit within 15 days of an inverse H&S signal on the same ticker. The other three patterns reproduced their known figures in the same runs.
• Against the gate it passes narrowly: the thinnest edge adopted so far, about 20 signals a year at half the H&S's per-signal expectancy. Review after the first 30 live signals.

Changes

• ACTIVE_PATTERNS gains "Double Bottom"; the report's age and listing limits and meta follow (8 bars, 6 sessions).
• The page explains the pattern in plain words and quotes its eleven-year figure next to the others.
• The replay's wait_bars and depth_atr features read the W's notes (L2 is its last anchor; depth is peak minus the lower low), and _drop_reason names "second low".
• Tests (164): the mini universe gains a double bottom, so the end-to-end scan, the second and third runs, the report's age table and the backtest see four patterns; the random-walk false-positive bound of the scan moves from 5 % to 8 %, since the fourth detector fires on about 4 % of random walks (the other three on 2 %; the pattern's 10 % rise rule is what holds it there).
• Docs: wiki 02 (status), wiki 03 ("The double bottom, tested", the constants' header, the ledger of adopted values), wiki 04, README (four patterns), changelog.

Closes #126.

Test plan

• ruff clean, 164 tests pass locally
• tests workflow and the backtest smoke run on this PR
• tonight's scan: the report may list a Double Bottom row; the page explains it under "Why these stocks"

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