chore(release): 0.18.0 -- evidence in R, DCA simulated once a day, pooled evaluation as policy

[eaitbrahim]

Version bump for 0.18.0: the eight workspace versions, the inter-package == pins, and uv.lock. Same shape as 0.17.0 (#818): 9 files, 25 lines in and 25 out. uv lock --check passes.

Why a minor bump: #826 changes what promotion decides. G2 and #338's pooled path now judge in R, min_expectancy is an R threshold, and a sample with no R is refused. #825 adds new report sections. No schema change since v0.17.0 (keel/data/ is untouched).

What's in it

• fix(research): the edge table, G2 and promotion judge R, not price units (#820) #826 (simulate: the Edge table's "unit-less R-multiples" are price units, so the pooled row is BTC #820): the backtest edge table, G2 and promotion work in R rather than price units. A losing trade that gapped below its stop now gets a negative R, and pooled rows are in exit-time order.
• fix(sim): DCA buys once per completed day, and the report shows its sleeve (#821) #825 (simulate: the DCA rule produced 0 trades in a 5-year backtest #821): keel simulate buys DCA once per completed day (it bought 24 times per cadence day), with no forming-day look-ahead, and reports the DCA holdings at market value.
• docs(adr): 0006 -- daily strategies are evaluated on the pooled sample, never per asset (#822) #824 (ADR 0006: daily strategies are evaluated on the pooled sample (n >= 100 pooled), never per asset #822): ADR 0006, daily strategies are evaluated on the pooled sample.
• docs(experiments): the hourly turtle over five years -- 4,871 trades, 0 of 19 positive at the fee paid (#823) #827 (Experiment: 5-year backtest of the hourly Turtle for a per-asset sample (N > 100), at the fees actually paid #823): experiment record for the hourly Turtle, 4,871 trades.
• chore(live): per-asset ceiling 0.50 -> 0.75 ($200 -> $300) #819: the live per-asset ceiling config mirrored into the repo (0.50 → 0.75).

Live trading is unaffected. These changes touch offline tooling and promotion only. Replaying 14 days of real live candles through the new DCA code gave the same buy days as before.

After merge

1. Run Actions → Release with version 0.18.0.
2. Install into ~/keel using the runbook's steps: back up each database, install the five wheels, run keel migrate (nothing to apply), then keel versions (must show [release]) and keel status.
3. Restart the three running keel serve consoles. The hourly console is decommissioned.

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