docs: round out the docs for Z7's example additions

* examples/README.md — replace the single-row WASM section with a build
  block (one-time `wasm-pack` build), a serve note, and the full
  five-row table (`index`, `backtest`, `live_trading`, `multi_timeframe`,
  `parallel_assets`).
* examples/wasm/README.md — new dedicated index for the WASM demos
  with the build and serve commands and a description of every file
  including the module worker companion.
* CHANGELOG.md `[Unreleased]` gains three bullets: the Python and Node
  `fetch_btcusdt` siblings; the four new WASM browser demos; and the
  three new wiki pages from Z6 (TA-Lib-Migration, Cookbook, FAQ).

CHANGELOG.md

@@ -70,11 +70,27 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   tree: Rust moved into a new `examples/rust/` workspace member crate
   (`wickra-examples`, run via `cargo run -p wickra-examples --bin <name>`),
   Node into `examples/node/` with its own `package.json` linking `wickra` via
-  `file:../../bindings/node`, and the WASM browser demo into
+  `file:../../bindings/node`, and the WASM browser demos into
   `examples/wasm/`. The bundled BTCUSDT datasets move alongside them at
   `examples/data/`. Six new examples close the cross-language parity matrix:
   streaming demos for Python and Rust; multi-timeframe and parallel-assets
   demos for both Rust and Node.
+- Cross-language data-generator parity: `examples/python/fetch_btcusdt.py`
+  (stdlib only: `urllib` + `json` + `csv`) and `examples/node/fetch_btcusdt.js`
+  (Node 18+ built-in `fetch`) mirror the Rust `fetch_btcusdt` binary —
+  byte-for-byte identical CSV output on the same Binance snapshot.
+- Four additional WebAssembly browser demos under `examples/wasm/`
+  alongside the original `index.html`: `backtest.html` (fetch + basket of
+  indicators), `live_trading.html` (browser-native `WebSocket` to
+  Binance), `multi_timeframe.html` (in-page resample) and
+  `parallel_assets.html` + `parallel_worker.js` (module-Worker pool with
+  serial-vs-parallel speedup). The cross-language matrix is now closed
+  for every cell where the pattern makes sense.
+- Three new wiki pages: `TA-Lib-Migration.md` (full mapping table from
+  `talib.X(...)` calls to Wickra), `Cookbook.md` (seven concrete
+  strategy recipes — RSI mean reversion, MACD crossover, Bollinger
+  breakout, ADX-gated trend, multi-timeframe confirmation, SuperTrend,
+  chained indicators) and `FAQ.md`. All three linked from `Home.md`.
 
 ### Fixed
 - `Timeframe::floor` no longer overflows for timestamps near `i64::MIN`.