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-ForceIndex.md

@@ -8,7 +8,6 @@
 | Field | Value |
 |-------|-------|
 | Family | Volume |
-| Sub-category | Oscillators |
 | Input type | `Candle` (uses `close`, `volume`) |
 | Output type | `f64` |
 | Output range | unbounded around zero |
@@ -148,8 +147,8 @@ Alexander Elder's Force Index, introduced in *Trading for a Living* (1993).
 
 ## See also
 
-- [Indicator-Obv.md](Indicator-Obv.md) — cumulative signed volume, a coarser
+- [Indicator-Obv.md](../volume/Indicator-Obv.md) — cumulative signed volume, a coarser
   volume-conviction gauge.
-- [Indicator-VolumePriceTrend.md](Indicator-VolumePriceTrend.md) — cumulative
+- [Indicator-VolumePriceTrend.md](../volume/Indicator-VolumePriceTrend.md) — cumulative
   volume scaled by percentage move.
 - [Indicators-Overview.md](../../Indicators-Overview.md) — the full taxonomy.