chore(bench): curate benchmarks to ~30 representative indicators

[kingchenc]

Summary

Replaces the exhaustive 114-indicator benchmark list with a curated selection: the cheapest baseline and the most expensive representative from each of the sixteen families, totalling ~33 entries across scalar / candle / multi-output APIs.

Why

The exhaustive bench list ran every indicator at three workload sizes (1k / 10k / 50k candles), pushing `cargo bench -p wickra` past ten minutes for diminishing signal — most family members are linear scalings of the same hot loop, so a regression shows up identically in the cheapest member.

The curated list keeps the regression-detection value while cutting bench runtime by ~3-4×. If a contributor needs to profile a specific indicator that is not in the curated set, they can add it temporarily and run `cargo bench -- ` to target just that bench — does not need to be committed.

Curation by family

Family	Kept
Moving Averages	Sma, Ema, Frama, Jma, T3
Momentum Oscillators	Rsi, Cci, ConnorsRsi
Trend & Directional	Adx, WaveTrend
Price Oscillators	Macd, Ppo, Stc
Volatility & Bands	Atr, Bollinger, Parkinson, YangZhang
Bands & Channels	TtmSqueeze, VwapStdDevBands
Trailing Stops	Psar, SuperTrend
Volume	Obv, Vwap, RollingVwap
Price Statistics	LinearRegression, HurstExponent, Autocorrelation
Ehlers / Cycle	Mama, HilbertDominantCycle, EmpiricalModeDecomposition
Pivots	ClassicPivots
DeMark	TdSequential
Ichimoku	Ichimoku
Candlestick Patterns	Engulfing
Market Profile	ValueArea
Risk / Performance	SharpeRatio, MaxDrawdown, CalmarRatio, ValueAtRisk

Bug fixes carried in passing

• `Cci` is `Indicator<Input = Candle>`, not f64; the old call had it on `bench_scalar` which would have failed to compile if it had been added recently. Corrected to `bench_candle_input`.
• `Psar::new` takes `(af_start, af_step, af_max)` — the old call supplied only two arguments.
• `TdSequential` uses `::classic` for the textbook (4, 9, 2, 13) parameters.

Diff stats

`1 file changed, 120 insertions(+), 304 deletions(-)` — net 184 LOC removed.

Verification

• `cargo bench --manifest-path crates/wickra/Cargo.toml --no-run` compiles clean.
• No bench function bodies changed; helper signatures unchanged.

Conflict status

Independent of the three open PRs (#59, #60, #61). No shared files.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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