docs(wiki): add Cookbook, TA-Lib migration table and FAQ

Three content gaps in the wiki: there was no migration story for users
porting from TA-Lib, no strategy cookbook, and no FAQ. Add all three as
self-contained pages and link them from Home.md's "Wiki contents".

* docs/wiki/TA-Lib-Migration.md — full one-to-one mapping table from
  every common talib.X(...) call to the equivalent Wickra expression,
  plus a "what Wickra has that TA-Lib does not" / "what TA-Lib has that
  Wickra does not (yet)" delta.
* docs/wiki/Cookbook.md — seven concrete strategy recipes (RSI mean
  reversion, MACD histogram crossover, Bollinger breakout, ADX-gated
  trend, multi-timeframe confirmation, SuperTrend trailing stop,
  Chain<EMA, RSI>) with Rust or Python snippets.
* docs/wiki/FAQ.md — common questions on warmup, NaN handling, thread
  safety, installation, performance and comparing Wickra to TA-Lib /
  pandas-ta / talipp / finta.

Also extend the [Unreleased] CHANGELOG entry that records the
examples/<lang>/ restructure with the wiki additions; Home.md gains
three new bullets under "Wiki contents".

docs/wiki/Home.md

@@ -62,6 +62,14 @@ Release notes and tagged builds:
 - [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.
+- [Cookbook](Cookbook.md) — copy-paste strategy recipes built on streaming
+  indicators (RSI mean reversion, MACD crossover, Bollinger breakout,
+  ADX-gated trend, multi-timeframe, SuperTrend trailing stop).
+- [TA-Lib Migration](TA-Lib-Migration.md) — function-by-function mapping
+  table from TA-Lib's `talib.X(...)` calls to the equivalent Wickra
+  expressions.
+- [FAQ](FAQ.md) — quick answers to the most common questions about
+  warmup, NaN handling, thread safety, and the streaming-vs-batch contract.
 
 ### Indicator reference