E4: commit the documentation sources

The 33 Markdown files under docs/wiki/ were never tracked. Commit them
into the repository so the documentation is versioned alongside the
code: 8 top-level pages plus 25 per-indicator deep dives under
indicators/{momentum,trend,volatility,volume}/.

The pages are kept in-repo (not pushed to a flat GitHub Wiki), so the
relative indicators/<family>/... links in Home.md resolve correctly
when rendered on GitHub.

docs/wiki/Home.md

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+# Wickra
+
+Wickra is a streaming-first technical-indicators library. Every indicator is
+implemented in Rust as an O(1) state machine that consumes one input at a
+time, and the same engine is exposed through ergonomic bindings for Python,
+Node.js, WebAssembly, and Rust itself. The same `update` call you write inside
+a live trading loop also drives the historical backtest of that same
+strategy — there is no second code path that drifts behind the streaming one.
+
+The project ships 25 indicators across the four classical families (trend,
+momentum, volatility, volume) and a small set of supporting types (`Candle`,
+`Tick`, `Chain`). The Rust core forbids `unsafe`, so every binding inherits a
+memory-safe implementation. Install is one command on every supported
+platform: `pip install wickra`, `cargo add wickra`, `npm install wickra` — no
+system compilers, no C dependencies, no headers.
+
+Wickra is licensed under the **PolyForm Noncommercial 1.0.0** license.
+Personal projects, research, hobby trading bots, education, non-profits, and
+government use are all permitted; commercial sale of the software or of
+services built around it is not. If you want to use Wickra commercially,
+open an issue on GitHub to discuss a separate license.
+
+## Published versions
+
+| Registry  | Package        | Version |
+|-----------|----------------|---------|
+| crates.io | `wickra`       | 0.1.4   |
+| crates.io | `wickra-core`  | 0.1.4   |
+| crates.io | `wickra-data`  | 0.1.4   |
+| PyPI      | `wickra`       | 0.1.4   |
+| npm       | `wickra`       | 0.1.4   |
+| npm       | `wickra-wasm`  | 0.1.4   |
+
+Release notes and tagged builds:
+<https://github.com/kingchenc/wickra/releases>.
+
+## Wiki contents
+
+- [Quickstart: Python](Quickstart-Python.md) — `pip install wickra`, a batch
+  RSI on a NumPy array, a streaming RSI loop, and the multi-column NaN
+  pattern that MACD and friends share.
+- [Quickstart: Rust](Quickstart-Rust.md) — `cargo add wickra`, batch and
+  streaming via the `Indicator` and `BatchExt` traits, and the `Chain`
+  combinator.
+- [Quickstart: Node](Quickstart-Node.md) — `npm install wickra`, basic
+  `SMA` and `MACD` calls, and the current Windows install caveat
+  (`wickra-win32-x64-msvc@0.1.4` is held by the npm spam filter).
+- [Streaming vs Batch](Streaming-vs-Batch.md) — the conceptual difference
+  between Wickra's O(1) `update` and the recompute-everything loops in
+  batch-only libraries, with the benchmark numbers from the project README.
+- [Warmup Periods](Warmup-Periods.md) — a verified table of every
+  indicator's `warmup_period()`, plus the reasoning behind the off-by-one
+  cases (RSI(14) needs 15 inputs because it needs 14 diffs).
+- [Indicator Chaining](Indicator-Chaining.md) — `Chain::new(first, second)`
+  and `.then(third)`, with a worked EMA(14) → RSI(7) example and the rule
+  for stacked warmups.
+
+### Indicator reference
+
+Start with [Indicators-Overview.md](Indicators-Overview.md) for the
+cross-cutting taxonomy (trend / momentum / volatility / volume) and the
+shared `Indicator` trait surface. The per-indicator pages below cover
+formulas, parameters, warmup behaviour, edge cases, and verified
+Rust / Python / Node examples. They are grouped by family, mirroring the
+`indicators/<family>/` directory layout.
+
+**Trend** — smooth the price series to surface direction.
+
+- [Indicator-Sma.md](indicators/trend/Indicator-Sma.md)
+- [Indicator-Ema.md](indicators/trend/Indicator-Ema.md)
+- [Indicator-Wma.md](indicators/trend/Indicator-Wma.md)
+- [Indicator-Dema.md](indicators/trend/Indicator-Dema.md)
+- [Indicator-Tema.md](indicators/trend/Indicator-Tema.md)
+- [Indicator-Hma.md](indicators/trend/Indicator-Hma.md)
+- [Indicator-Kama.md](indicators/trend/Indicator-Kama.md)
+
+**Momentum** — measure the rate of price change rather than the level.
+
+- [Indicator-Rsi.md](indicators/momentum/Indicator-Rsi.md)
+- [Indicator-MacdIndicator.md](indicators/momentum/Indicator-MacdIndicator.md)
+- [Indicator-Stochastic.md](indicators/momentum/Indicator-Stochastic.md)
+- [Indicator-Cci.md](indicators/momentum/Indicator-Cci.md)
+- [Indicator-Roc.md](indicators/momentum/Indicator-Roc.md)
+- [Indicator-WilliamsR.md](indicators/momentum/Indicator-WilliamsR.md)
+- [Indicator-Adx.md](indicators/momentum/Indicator-Adx.md)
+- [Indicator-Mfi.md](indicators/momentum/Indicator-Mfi.md)
+- [Indicator-Trix.md](indicators/momentum/Indicator-Trix.md)
+- [Indicator-AwesomeOscillator.md](indicators/momentum/Indicator-AwesomeOscillator.md)
+- [Indicator-Aroon.md](indicators/momentum/Indicator-Aroon.md)
+
+**Volatility** — envelope width and per-bar dispersion measures.
+
+- [Indicator-BollingerBands.md](indicators/volatility/Indicator-BollingerBands.md)
+- [Indicator-Atr.md](indicators/volatility/Indicator-Atr.md)
+- [Indicator-Keltner.md](indicators/volatility/Indicator-Keltner.md)
+- [Indicator-Donchian.md](indicators/volatility/Indicator-Donchian.md)
+- [Indicator-Psar.md](indicators/volatility/Indicator-Psar.md)
+
+**Volume** — price moves weighted or confirmed by traded volume.
+
+- [Indicator-Obv.md](indicators/volume/Indicator-Obv.md)
+- [Indicator-Vwap.md](indicators/volume/Indicator-Vwap.md)
+
+## See also
+
+- Source code: <https://github.com/kingchenc/wickra>
+- Releases: <https://github.com/kingchenc/wickra/releases>
+- Issue tracker: <https://github.com/kingchenc/wickra/issues>