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kingchenc e385734275 feat(microstructure): trade-sign autocorrelation, PIN, Hasbrouck information share (B15) (#212 )

## B15 Microstructure — three new indicators (485 → 488)

| Indicator | Input | Output | Notes |
|-----------|-------|--------|-------|
| `TradeSignAutocorrelation` | `Trade` | `f64` ∈ [-1,1] | lag-1 autocorrelation of the signed aggressor (order-flow persistence) |
| `Pin` | `Trade` | `f64` ∈ [0,1] | probability of informed trading from rolling buy/sell imbalance (EKOP single-window estimator); `name()` = `"PIN"` |
| `HasbrouckInformationShare` | `(f64, f64)` | `f64` ∈ [0,1] | variance-ratio proxy for each venue's share of price discovery |

### Wiring
- Core structs + full unit tests (every branch).
- Hand-written Python/Node/WASM bindings for the two `Trade`-input indicators (precedent `TradeImbalance`); `node_pair_indicator!` / `wasm_pair_indicator!` macro bindings + hand Python pyclass for the pairwise Hasbrouck (precedent `RollingCorrelation`).
- Fuzz drives added to `indicator_update_trade.rs` and `indicator_update_pair.rs`.
- Dedicated Python + Node streaming-vs-batch and reference tests; Hasbrouck in the `PAIR` registry.
- README counter (3 spots) + `docs/README.md` + `FAMILIES` assert bumped to 488.

### Verify (all green, local)
- `cargo test -p wickra-core --lib`: 3991 passed
- `cargo test -p wickra-core --doc`: 438 passed
- `cargo clippy --workspace --all-targets --all-features -- -D warnings`: clean
- node: 561 passed · pytest: 926 passed

2026-06-08 03:07:50 +02:00

README.md

feat(microstructure): trade-sign autocorrelation, PIN, Hasbrouck information share (B15) (#212 )

2026-06-08 03:07:50 +02:00

README.md

Documentation

Wickra's full documentation lives at docs.wickra.org.

That includes:

Quickstarts for Rust, Python, Node, and WASM.
A per-indicator deep dive for every one of the 488 indicators across the sixteen families (Moving Averages, Momentum Oscillators, Trend & Directional, Price Oscillators, Volatility & Bands, Bands & Channels, Trailing Stops, Volume, Price Statistics, Ehlers / Cycle DSP, Pivots & S/R, DeMark, Ichimoku & Charts, Candlestick Patterns, Market Profile, Risk / Performance) — see the indicators overview.
Reference pages: warmup periods, streaming vs batch, indicator chaining, and the data layer.
Guides: Cookbook, TA-Lib migration, FAQ.

Editing the docs

The documentation site is a separate git repository at https://github.com/wickra-lib/wickra-docs. Open a pull request there to propose changes; the site is built with VitePress and deploys to docs.wickra.org.