F13c: restructure the indicator catalogue into eight families

The original taxonomy was four classical families plus a statistics group,
with the F1-F12 expansion slotted in as sub-categories. This regroups the
whole 71-indicator catalogue into eight top-level families, each with at
least five members:

  Moving Averages (12), Momentum Oscillators (13), Trend & Directional (9),
  Price Oscillators (5), Volatility & Bands (12), Trailing Stops (5),
  Volume (9), Price Statistics (7).

- Wiki: docs/wiki/indicators/ reorganised into eight family folders; all 71
  indicator pages moved with `git mv`. Every internal cross-link is
  normalised to `../<family>/Indicator-X.md`, each page's `Family` field is
  set to its new family, and two pre-existing `../Indicator-Chaining.md`
  links (should have been `../../`) are corrected. A link check confirms
  every relative wiki link resolves.
- Indicators-Overview.md fully rewritten around the eight families;
  Home.md indicator reference and the README family table follow suit.
- Warmup-Periods.md gains the eight F13 indicators; CHANGELOG records the
  46-indicator expansion (25 -> 71) and the eight-family taxonomy.
- Tests: Node indicators.test.js and Python test_new_indicators.py cover
  all eight new indicators (Node 91/91, Python 117/117 green).

cargo fmt + clippy (core/wickra/data/wasm/node) clean; 508 core tests,
25 data tests and 74 doctests green.

docs/wiki/indicators/volume/Indicator-Vwap.md

@@ -12,8 +12,7 @@ This page documents two distinct public types — jump straight to
 
 | Item                | Value                                                          |
 |---------------------|----------------------------------------------------------------|
-| Family              | Volume                                                         |
-| Sub-category        | cumulative (`Vwap`) / rolling (`RollingVwap`)                  |
+| Family | Volume |
 | Input type          | `Candle` (uses `high`, `low`, `close`, `volume`)               |
 | Output type         | `f64`                                                          |
 | Output range        | unbounded (price-units)                                        |
@@ -286,9 +285,9 @@ At `t = 4` with window `[20@3, 30@1, 40@2]`:
 
 ## See also
 
-- [OBV](Indicator-Obv.md) — cumulative signed-volume measure that pairs
+- [OBV](../volume/Indicator-Obv.md) — cumulative signed-volume measure that pairs
   well with VWAP as a divergence flag.
-- [MFI](../momentum/Indicator-Mfi.md) — money-flow oscillator that also blends
+- [MFI](../momentum-oscillators/Indicator-Mfi.md) — money-flow oscillator that also blends
   typical price with volume.
-- [Bollinger Bands](../volatility/Indicator-BollingerBands.md) — non-volume volatility
+- [Bollinger Bands](../volatility-bands/Indicator-BollingerBands.md) — non-volume volatility
   envelope, often layered alongside VWAP on intraday charts.